I'm having a problem with chapters starting back at "1"

Here is a script I always wanted to write. It provides a report of all of your paragraphs that have autonumbering applied. It gives you the actual number (or text), followed by the building blocks. It should help troubleshoot instances where the numbers aren't correct.

To use the script, copy it into a plain text file and save it in a convenient location with a .jsx extension. Open your document or book and choose File > Script > Run and select the script. You should get the Book Error Log with all of your autonumber data. If you look at the entries above where the number resets to 5.1, you should discover the paragraph that is incorrectly resetting the number. If you have trouble figuring it out, save the log file or take a screenshot of the log above the 5.1 paragraph.

To save the Book Error Log, you must unlock it first. Press Esc F l k (l = lower-case L) in sequence to unlock the file. Then you can save it as a regular FrameMaker document.

/* CP-AutonumberReport.jsx Version 0.1b March 25, 2025
Copyright 2025, Carmen Publishing Inc. All rights reserved.

For information, call 585-729-6746 or email rick@frameexpert.com.

Not to be resold without permission.

Version 0.1b March 25, 2025: First release of the script. 
*/

#target framemaker

var CP_ANR = CP_ANR || {};
CP_ANR.version = "Version 0.1b March 25, 2025";
CP_ANR.file = $.fileName;

CP_ANR.main = function () {
    
    var book, doc, markerType, counter;
    
    book = app.ActiveBook;
    if (book.ObjectValid () === 1) {
        CP_ANR.processBook (book);
    }
    else {
        doc = app.ActiveDoc;
        if (doc.ObjectValid () === 1) {
            CP_ANR.processDoc (doc, 0);
        }        
    }
};

CP_ANR.processDoc = function (doc, bookId) {

    var pgf;
    
    // Process all paragraphs in the main flow.
    pgf = doc.MainFlowInDoc.FirstTextFrameInFlow.FirstPgf;
    while (pgf.ObjectValid () === 1) {
        CP_ANR.processPgf (pgf, doc, bookId);
        pgf = pgf.NextPgfInFlow;
    }
};

CP_ANR.processBook = function (book) {
    
    var bookComp, doc, regex;
    
    // Regular expression for standard FrameMaker documents.
    regex = /\.fm$/i;
    
    // Loop through all of the components in the book.
    bookComp = book.FirstComponentInBook;
    while (bookComp.ObjectValid () === 1) {
        if (bookComp.ExcludeBookComponent === 0) {
            if (regex.test (bookComp.Name) === true) {
				// Skip generated files.
				if (bookComp.BookComponentType === Constants.FV_BK_NOT_GENERATABLE) {
					// Get the document returned in a JavaScript object.
					doc = CP_ANR.getDocument (bookComp.Name, undefined, false);
					if ((doc) && (doc.ObjectValid () === 1)) {
						book.StatusLine = "Processing " + new File (bookComp.Name).displayName;
						// Call the function to get the document's autonumber data.
						CP_ANR.processDoc (doc, book.id)
						// If the document was opened by the script, save it and close it.
						if (doc.openedByScript === true) {
							//doc.SimpleSave (bookComp.Name, false);
							doc.Close (true);
						}
					}
				}
			}
        }
        bookComp = bookComp.NextBookComponentInDFSOrder;
    }

    // Reset the book status line.
    book.StatusLine = "";
};

CP_ANR.processPgf = function (pgf, doc, bookId) {
    
    var textList, count, i, msg;

    if (pgf.PgfIsAutoNum === 1) {
        msg = pgf.PgfNumber + " " + pgf.AutoNumString;
        msg = CP_ANR.writeBookErrorLog (pgf.id, doc.id, bookId, msg);    
    }

    // Get any tables in the paragraph.
    textList = pgf.GetText (Constants.FTI_TblAnchor);
    count = textList.length;
    for (i = 0; i < count; i += 1) {
        // Process the table.
        CP_ANR.processTbl (textList[i].obj, doc, bookId);
    }
};

CP_ANR.writeBookErrorLog = function (objId, docId, bookId, msg) { 
    
    /// msg = CP_ANR.writeBookErrorLog (objId, docId, bookId, msg);
    
    msg = 'log -b=' + bookId + ' -d=' + docId + ' -o=' + objId + ' --' + msg;
    CallClient ('BookErrorLog', msg);
    
    return msg; // Return for troubleshooting.
};

CP_ANR.processTbl = function (tbl, doc, bookId) {
    
    var pgf, cell;
    
    // If the title is at the top, process it first.
    if (tbl.TblTitlePosition === Constants.FV_TBL_TITLE_ABOVE) {
        pgf = tbl.FirstPgf;
        while (pgf.ObjectValid () === 1) {
            if (pgf.PgfIsAutoNum === 1) {
                CP_ANR.processPgf (pgf, doc, bookId);
            }
            pgf = pgf.NextPgfInFlow;
        }
    }

    // Process each cell and its paragraphs.
    cell = tbl.FirstRowInTbl.FirstCellInRow;
    while (cell.ObjectValid () === 1) {
        if (cell.CellIsStraddled === 0) {
            pgf = cell.FirstPgf;
            while (pgf.ObjectValid () === 1) {
                if (pgf.PgfIsAutoNum === 1) {
                    CP_ANR.processPgf (pgf, doc, bookId);
                }
                pgf = pgf.NextPgfInFlow;
            }
        }
        cell = cell.NextCellInTbl;
    }
    
    // IF the title is at the bottom, process it last.
    if (tbl.TblTitlePosition === Constants.FV_TBL_TITLE_BELOW) {
        while (pgf.ObjectValid () === 1) {
            if (pgf.PgfIsAutoNum === 1) {
                CP_ANR.processPgf (pgf, doc, bookId);
            }
            pgf = pgf.NextPgfInFlow;
        }
    } 
};

CP_ANR.getDocument = function (filename, structuredApplication, visible) {
    
    var doc;
    
    // See if the document is already open.
    doc = CP_ANR.docIsOpen (filename);
    if ((doc) && (doc.ObjectValid () === 1)) {
        return doc;
    } 
    else {
        // The document is not already open, so open it.
        return CP_ANR.openDocOrBook (filename, structuredApplication, visible);
    }
};

CP_ANR.docIsOpen = function (filename) {
    
    var file, name, doc;
    
    // Make a File object from the file name.
    file = new File (filename);
    // Uppercase the filename for easy comparison.
    name = file.fullName.toUpperCase ();

    // Loop through the open documents in the session.
    doc = app.FirstOpenDoc;
    while (doc.ObjectValid () === 1) {
        // Compare the document’s name with the one we are looking for.
        if (new File (doc.Name).fullName.toUpperCase () === name) {
            // The document we are looking for is open.
            doc.openedByScript = false;
            return doc;
        }
        doc = doc.NextOpenDocInSession;
    }
};

CP_ANR.openDocOrBook = function (filename, structuredApplication, visible) {
    
    var i = 0, docOrBook = 0, openProps, returnProps;

    // Get default property list for opening documents.
    openProps = GetOpenDefaultParams ();
    // Get a property list to return any error messages.
    returnProps = new PropVals ();

    // Set specific open property values to open the document.
    i = GetPropIndex (openProps,Constants.FS_AlertUserAboutFailure);
    openProps[i].propVal.ival=false;
    i = GetPropIndex (openProps,Constants.FS_MakeVisible);
    openProps[i].propVal.ival=visible;
    i = GetPropIndex (openProps,Constants.FS_FileIsOldVersion);
    openProps[i].propVal.ival=Constants.FV_DoOK;
    i = GetPropIndex (openProps,Constants.FS_FileIsInUse);
    openProps[i].propVal.ival=Constants.FV_ResetLockAndContinue;
    i = GetPropIndex (openProps,Constants.FS_FontChangedMetric);
    openProps[i].propVal.ival=Constants.FV_DoOK;
    i = GetPropIndex (openProps,Constants.FS_FontNotFoundInCatalog);
    openProps[i].propVal.ival=Constants.FV_DoOK;
    i = GetPropIndex (openProps,Constants.FS_FontNotFoundInDoc);
    openProps[i].propVal.ival=Constants.FV_DoOK;
    i = GetPropIndex (openProps,Constants.FS_RefFileNotFound);
    openProps[i].propVal.ival=Constants.FV_AllowAllRefFilesUnFindable;
    i = GetPropIndex (openProps,Constants.FS_UseRecoverFile);
    openProps[i].propVal.ival=Constants.FV_DoNo;
    if (structuredApplication !== undefined) {
        i = GetPropIndex (openProps,Constants.FS_StructuredOpenApplication);
        openProps[i].propVal.sval=structuredApplication;
    }

    // Attempt to open the document.
    docOrBook = Open (filename,openProps,returnProps);

    if (docOrBook.ObjectValid () === 1) {
        // Add a property to the document or book, indicating that the script opened it.
        docOrBook.openedByScript = true;
    }
    else {
        // If the document can't be open, print the errors to the Console.
        PrintOpenStatus (returnProps);
        Console ("\r" + filename);
    }

    return docOrBook; // Return the document or book object.
};

CP_ANR.main ();