Paragraph style for text box listed as "(No Styles)" despite having applied paragraph style to it?
Hello all. I have been working on this document for quite some time now, and I've noticed that a lot of textboxes (seemingly at random) show "(No Styles)" in the "Paragraph Styles" section under the "Text Style" window, despite me having applied paragraph styles to it before. When I try to apply a paragraph style to said textbox, nothing changes, no visible change occurs, and the little preview window of the style with the letters "Ag" does not appear in the window displaying the current style chosen.
Additionally, Preflight states that a few (three or so) textboxes have overset text, but said textboxes lack the red plus sign indicating overset text.
Here you can see that no style is selected.

This is what it looks like when I try to apply a text. The "Ag" preview is not by the name of the style. Once I click away and return back to it it states "(No Styles)" again.
Please help! I'm really quite scared at the thought of the document having gotten corrupted, as I've been working on this intensively for days now. I tried to save a copy of it, restarting the computer, but it still has the same issue. "Forcing" it to apply the style does not work. I've read that one can export it as an IDML and then save it as a new InDesign document, but I would like to consider that a last-ditch effort. I am running Windows 10 and InDesign version 19.3.
