Why is this script not applying paragraph styles

// Define a function for your script
function myScript() {
    // Create a dialog box
    var dialog = app.dialogs.add({
        name: "Body Text Size",
        canCancel: true
    });

    // Add a dialog column
    var dialogColumn = dialog.dialogColumns.add();

    // Add a static text field
    var staticText = dialogColumn.staticTexts.add({
        staticLabel: "Enter the body text size in points:"
    });

    // Add an editbox for user input
    var editbox = dialogColumn.textEditboxes.add({
        minWidth: 100
    });

    // Add a static text field for preset ratios
    var presetRatiosText = dialogColumn.staticTexts.add({
        staticLabel: "Preset Ratios (Select One):"
    });

    // Add a dropdown with the specified names and scale factors, including "None"
    var dropdown = dialogColumn.dropdowns.add({
        stringList: ["None", "1.067 - Minor Second", "1.125 - Major Second", "1.200 - Minor Third", "1.250 - Major Third", "1.333 - Perfect Fourth", "1.414 - Augmented Fourth", "1.500 - Perfect Fifth", "1.618 - Golden Ratio"]
    });

    // Set "None" as the default selection
    dropdown.selectedIndex = 0;

    // Add a static text field for custom scale factor
    var customScaleFactorText = dialogColumn.staticTexts.add({
        staticLabel: "OR Enter a Custom Scale Factor:"
    });

    // Add an editbox for custom scale factor input
    var customScaleFactorEditbox = dialogColumn.textEditboxes.add({
        minWidth: 100
    });

    // Show the dialog box
    if (dialog.show() == true) {
        // Get the user's input from the dropdown
        var selectedOption = dropdown.selectedIndex;

        // Get the user's input from the custom scale factor editbox
        var customScaleFactor = parseFloat(customScaleFactorEditbox.editContents);

        // Get the body text size input
        var bodyTextSize = parseFloat(editbox.editContents);

        // Check if both preset and custom scale factors are entered
        if (selectedOption !== 0 && !isNaN(customScaleFactor)) {
            alert("Please pick either a preset ratio or enter a custom scale factor, not both.");
            dialog.destroy();
            return;
        }

        // Define an array of scale factors corresponding to the dropdown options
        var scaleFactors = [null, 1.067, 1.125, 1.200, 1.250, 1.333, 1.414, 1.500, 1.618]; // Use null for "None"

        // Get the selected scale factor or the user-defined scale factor
        var scaleFactor;
        if (selectedOption === 0) {
            // If "None" is selected, use the custom scale factor
            scaleFactor = customScaleFactor;
        } else {
            scaleFactor = scaleFactors[selectedOption];
        }

        var doc = app.activeDocument;

        // Function to create or update a paragraph style with rounded font size and leading (line height)
        function createOrUpdateParagraphStyle(styleName, pointSize, scaleFactor) {
            try {
                var style = doc.paragraphStyles.itemByName(styleName);
                // Set the font size after rounding it to the nearest 0.5
                style.pointSize = roundToNearestHalf(pointSize);
                // Set the leading (line height) after rounding it to the nearest 0.5
                style.leading = roundToNearestHalf(pointSize);
                style.hyphenation = false; // Disable hyphenation
            } catch (e) {
                style = doc.paragraphStyles.add({
                    name: styleName,
                    // Set the font size after rounding it to the nearest 0.5
                    pointSize: roundToNearestHalf(pointSize),
                    // Set the leading (line height) after rounding it to the nearest 0.5
                    leading: roundToNearestHalf(pointSize),
                    hyphenation: false // Disable hyphenation
                });
            }
        }

        // Create or update paragraph styles with calculated sizes based on the selected scale factor
        if (!isNaN(bodyTextSize) && selectedOption > 0) {
            createOrUpdateParagraphStyle("Header", bodyTextSize * 1.5 * scaleFactor * 2, scaleFactor);
            createOrUpdateParagraphStyle("Subheader", bodyTextSize * scaleFactor * 1.35, scaleFactor);
            createOrUpdateParagraphStyle("Quote", bodyTextSize * 1.35, scaleFactor);
            createOrUpdateParagraphStyle("Caption", bodyTextSize * 0.76, scaleFactor);
            createOrUpdateParagraphStyle("Label", bodyTextSize, scaleFactor);
            createOrUpdateParagraphStyle("Body Text", bodyTextSize, scaleFactor);

            // Get the currently active spread and page
            var activeSpread = app.activeWindow.activeSpread;
            var activePage = app.activeWindow.activePage;

            // Get the document's measurement units (inches, millimeters, points, etc.)
            var docUnits = app.activeDocument.viewPreferences.horizontalMeasurementUnits;

            // Define the margin value (in inches for consistency)
            var margin = 0.16667; // 0.16667 inches is approximately 12 points

            // Convert margin to points based on the document's units
            if (docUnits === MeasurementUnits.MILLIMETERS) {
                // Convert millimeters to points (1 millimeter = 2.83465 points)
                margin *= 2.83465;
            }

            // Calculate the bounds within the margins for the active page
            var textFrameBounds = [
                activePage.bounds[1] + activePage.marginPreferences.top + margin, // Top
                activePage.bounds[0] + activePage.marginPreferences.left + margin, // Left
                activePage.bounds[2] - activePage.marginPreferences.bottom - margin, // Bottom
                activePage.bounds[3] - activePage.marginPreferences.right - margin // Right
            ];

            // Create a text frame within the adjusted bounds on the active page
            var textFrame = activePage.textFrames.add({
                geometricBounds: textFrameBounds,
                fillColor: "None",
                strokeColor: "None",
                autoSizingReferencePoint: AutoSizingReferenceEnum.TOP_LEFT_POINT,
                autoSizingType: AutoSizingTypeEnum.OFF // Prevent text frame resizing
            });

            // Define sample text in the desired order with Unicode escape sequences for quotes and larger line gaps
            var sampleText =
                "Header: Sample Header Text\r\r" + // Add two "\r" for larger line gap
                "Subheader: Sample Subheader Text\r\r" + // Add two "\r" for larger line gap
                "Body Text: Sample Body Text\r\r" + // Add two "\r" for larger line gap
                "Quote: \u201CSample Quote Text\u201D\r\r" + // Add two "\r" for larger line gap and Unicode escape sequences for smart quotes
                "Caption: Sample Caption Text\r\r" + // Add two "\r" for larger line gap
                "Label: Sample Label Text";

            // Place the sample text in the text frame and apply paragraph styles
            textFrame.contents = sampleText;
            var paragraphs = textFrame.parentStory.paragraphs;
            for (var i = 0; i < paragraphs.length; i++) {
                var paragraph = paragraphs[i];
                var styleName = paragraph.contents.split(":")[0];
                var style = doc.paragraphStyles.itemByName(styleName);
                if (style.isValid) {
                    paragraph.appliedParagraphStyle = style;
                }
            }

            alert("Styles created or updated:\nBody Text: " + roundToNearestHalf(bodyTextSize) + "pt\nHeader: " + roundToNearestHalf(bodyTextSize * scaleFactor * scaleFactor) + "pt\nSubheader: " + roundToNearestHalf(bodyTextSize * scaleFactor * 1.2) + "pt\nQuote: " + roundToNearestHalf(bodyTextSize) + "pt\nCaption: " + roundToNearestHalf(bodyTextSize) + "pt\nLabel: " + roundToNearestHalf(bodyTextSize) + "pt");
        } else if (!isNaN(bodyTextSize) && selectedOption === 0) {
            // No preset selected, use the custom scale factor
            createOrUpdateParagraphStyle("Header", roundToNearestHalf(bodyTextSize * 1.5 * scaleFactor * 2), scaleFactor);
            createOrUpdateParagraphStyle("Subheader", roundToNearestHalf(bodyTextSize * scaleFactor * 1.35), scaleFactor);
            createOrUpdateParagraphStyle("Quote", roundToNearestHalf(bodyTextSize * 1.35), scaleFactor);
            createOrUpdateParagraphStyle("Caption", roundToNearestHalf(bodyTextSize * 0.76), scaleFactor);
            createOrUpdateParagraphStyle("Label", roundToNearestHalf(bodyTextSize), scaleFactor);
            createOrUpdateParagraphStyle("Body Text", roundToNearestHalf(bodyTextSize), scaleFactor);

            // Get the currently active spread and page
            var activeSpread = app.activeWindow.activeSpread;
            var activePage = app.activeWindow.activePage;

            // Get the document's measurement units (inches, millimeters, points, etc.)
            var docUnits = app.activeDocument.viewPreferences.horizontalMeasurementUnits;

            // Define the margin value (in inches for consistency)
            var margin = 0.16667; // 0.16667 inches is approximately 12 points

            // Convert margin to points based on the document's units
            if (docUnits === MeasurementUnits.MILLIMETERS) {
                // Convert millimeters to points (1 millimeter = 2.83465 points)
                margin *= 2.83465;
            }

            // Calculate the bounds within the margins for the active page
            var textFrameBounds = [
                activePage.bounds[1] + activePage.marginPreferences.top + margin, // Top
                activePage.bounds[0] + activePage.marginPreferences.left + margin, // Left
                activePage.bounds[2] - activePage.marginPreferences.bottom - margin, // Bottom
                activePage.bounds[3] - activePage.marginPreferences.right - margin // Right
            ];

            // Create a text frame within the adjusted bounds on the active page
            var textFrame = activePage.textFrames.add({
                geometricBounds: textFrameBounds,
                fillColor: "None",
                strokeColor: "None",
                autoSizingReferencePoint: AutoSizingReferenceEnum.TOP_LEFT_POINT,
                autoSizingType: AutoSizingTypeEnum.OFF // Prevent text frame resizing
            });

            // Define sample text in the desired order with Unicode escape sequences for quotes and larger line gaps
            var sampleText =
                "Header: Sample Header Text\r\r" + // Add two "\r" for larger line gap
                "Subheader: Sample Subheader Text\r\r" + // Add two "\r" for larger line gap
                "Body Text: Sample Body Text\r\r" + // Add two "\r" for larger line gap
                "Quote: \u201CSample Quote Text\u201D\r\r" + // Add two "\r" for larger line gap and Unicode escape sequences for smart quotes
                "Caption: Sample Caption Text\r\r" + // Add two "\r" for larger line gap
                "Label: Sample Label Text";

            // Place the sample text in the text frame and apply paragraph styles
            textFrame.contents = sampleText;
            var paragraphs = textFrame.parentStory.paragraphs;
            for (var i = 0; i < paragraphs.length; i++) {
                var paragraph = paragraphs[i];
                var styleName = paragraph.contents.split(":")[0];
                var style = doc.paragraphStyles.itemByName(styleName);
                if (style.isValid) {
                    paragraph.appliedParagraphStyle = style;
                }
            }

            alert("Styles created or updated:\nBody Text: " + roundToNearestHalf(bodyTextSize) + "pt\nHeader: " + roundToNearestHalf(bodyTextSize * scaleFactor * scaleFactor) + "pt\nSubheader: " + roundToNearestHalf(bodyTextSize * scaleFactor * 1.2) + "pt\nQuote: " + roundToNearestHalf(bodyTextSize) + "pt\nCaption: " + roundToNearestHalf(bodyTextSize) + "pt\nLabel: " + roundToNearestHalf(bodyTextSize) + "pt");
        } else {
            alert("Invalid input. Please enter a valid body text size and either pick a preset ratio or enter a custom scale factor.");
        }

        // Close the dialog box
        dialog.destroy();
    } else {
        // User canceled the dialog
        dialog.destroy();
    }
}

// Function to round a number to the nearest 0.5
function roundToNearestHalf(number) {
    return Math.round(number * 2) / 2;
}

// Use app.doScript() to make the script undoable
app.doScript(myScript, ScriptLanguage.JAVASCRIPT, [], UndoModes.ENTIRE_SCRIPT, "Create or Update Styles");

I think this works but it seems to vary a bit regarding being the full size of inside the margins

not as big a deal but its so so