In design 20 - text jumping to next frame if tables are present

Hi everyone. I'm pulling my hair out on this one.  I have a very simple frame setup as seen in the picture, and for no apparent reason InDesign decides to split the text well before the frame's end

• All the text in the frame has one style, and for that style "Keep Options" are off. The parent of the style is "No paragraph style"
• The table is simply a 1 row, 2 column table
• There are no break characters of any kind anywhere.
• If I remove the table, the text flows properly.
• If I gradually add one-line paragraphs of text, at some point it will jump to the next frame and carry a whole bunch of the previous lines as well (see pic).

I've tried to search for similar issues  but most seem to be hidden jump or Keep together-related.

Any hints as to why this might be happening?

Thanks a lot in advancei.