title_body: How to avoid sporadic page breaks in epub when using page markers?
upvoted_answer: I cleaned up the code by deleting the excess id tags (these were added by inDesign when exporting to epub and were unnecessary), and that fixed it. Still no idea why this specific paragraph had issues and not others, which also contained excess id tags. Turns out, inDesign had added some nice little code to the CSS for the class "_idGenParaOverride-1" to ALWAYS page break after. So I guess the only lesson here is beware of the inDesign-created stylesheet...