Strange IOS ePub reactions

I’m trying to make a ePub for iPhone and iPad using the compiler. I’m getting different results view the same file on the devices.

On the iPhone I have multiple same pages on page turns, ie. when I turn the page the page number increments, but the same page is displayed as many as 3 or 4 times before it goes to the next page.

On the iPhone the pages are not justified, they are left aligned.

On the iPad, the pages are justified, and there are no multipage turns, but there are blank pages. The blank pages appear in the same place, ie. they are not randomly appearing, but they do not show in the iPhone. Again, same file.

Looking at the hidden formatting I do not see any cause of these blank pages.

Any ideas how to trouble shoot from here?