The graphic could have been hidden under another object. Unanchored, it would appear after the flow of the main story, at the end.
Is it a screenshot that you had in the document or what you think is a picture of one of the pages?
Nope, that's one the weird parts. There was no screenshot in my InDesign file. There were a few images, but they were all accounted for. The shot of text didn't take the whole page, I have a folio at the bottom locked to track which ePub I'm working on. It didn't capture that, just the block of text. And I didn't take any screens of my document.
But thank you for your ideas.
What version of InDesign are you using?
We would like to look into this - do you still have the original file somewhere, before you deleted the subsequent pages, and would you be willing to share it with the EPUB team for our internal use only?
Architect, InDesign Engineering