I have been reading some epub format from Baen a was noticing every few pages that 1 letter at the line end (different line positions) was fuzzy.
I was going to try an make a image until I noticed that these were tiny numbers. I changed from Zoom 3 or 4 on a page and it turns out to be the original text's page number showing up on the right edge.

Baen, Bug or just normal for epub?