Need help with indesign to reflowable ePub

Creating Reflowable ePubs is not intuitive. A knowledge of HTML and CSS can be invaluable for subsequent fine-tuning. In your InDesign document, you need to apply Paragraph (and Character) styles to all text, anchor images, no folios and note that content on Master/Parent pages is not implemented nor is the Paragraph Shading facility. After you've created your ePub test it on as many readers and devices you can.

Start with these basics:

https://nitrosyncretic.com/DPR/dpr_indesign_epub_basics.php

Export to PDF is, more or less, just printing; the document can have all kinds of sloppy elements and problems and still come out on pages just as you set it up. But export to reflowable e-book means the doc has to be 'technically' perfect or close to it, with meticulous use of styles,  avoiding elements that don't work (like tabs), and so forth.

See if any of that addresses your doc problems, and come on back for more questions if not. 🙂