Minon Pro appearing when defined paragraph styles are used

I want to know what is causing the following issue in InDesign. 

I apply a paragraph style (with no Minion Pro reference) to an article, text or complete document.

As you can see in (image 1) i applied the paragraph style 'brood' and in the left top corner you can see that the selected text is 'TheSansB' font.

When i put a blinking cursor at the end of a sentence and give a return for a blank line, then suddenly the deafault Minion Pro appears as the default font (image 2). As the cursor is blinking it still says that font is 'TheSans'.

I checked all my styles, styles override etc.. but the Minion Pro is nowwhere to be found.

Even when i have nothing selected dan my default font is 'TheSans'.

When processing large text for a book or magazine its very annoying ans unthrustworthy.

Does anyone know why this is happening?