I've got a couple amazon AZW3 kids books in calibre.
I've converted them to EPUB.
In the calibre view, they look fine.
When I load them on my son's Nook ST, the formatting is off. It's as if the page is zoomed in and part of it is cut off. Interestingly, when you goto the next page, you see just the complete text from the first page without the picture. (Screenshots attached)
I've converted loads of books from amazon to epub without issue. Even some other kids books.
Interestingly, my Nook Glowlight plus won't even open the epub.
I tired reconverting after upgrading to the latest version of Calibre, but that didn't have any effect.
Thank you!
Charles