Oh I can see this post is almost 1 month old... And I do not really have THE answer.. But goes anyway:
My experience is that iOS is much better in rendering EPUBs than Android, at least at the moment. So, perfectly Valid EPUBs might fail on Android device because its browsers or apps render same HTML codes according to their own "tabels" (not sure of that is the correct word). True, we have basis HTML but if that is not properly used in EPUB, then it will not show content as intended.
It has ben mentionned that img size max 1000 pix works.
Svg is an issue on Android. iOS have no problems with svg wrapping.
Do you use svg?
I would try to work on svg - max width and such, and if it does not work, I would simplify my HTML code in the EPUB in order to make it work across platforms.
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