epub file displayed paging differntly between Book app on OS (correct) vs iOS (wrong)

I did a search for this problem and could not find anything like it. Sorry if it has been discussed and if so, please point me to it.

I'm using Pages to create a book. I have exported it to an EPUB file. I can see it on my mac (OS 11.5.2 and Book v3.2) and on my iPad (iOS 15.2 and Book latest version). But the iOS Book is a bit off kilter in displaying.

And example is when a search is done. The search return shows what I expect on the MAC Book app, but the search return on the iPad shows the title from the previous TOC heading and the correct chunk of text with the searched-for text.

Mac OS Book Search Results

iPad iOS Book search results

Also the TOC is different, the iOS page numbering is off. The chapter for Slaty-tailed Trogon starts on page 114 in the OS and iOS view.

And the TOC on OS correctly shows this:

But the iOS TOC is off by a page.

Has anyone come across this? How can I tweak my Pages file to fix?

Help please!!!