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so windows 10, what is the reader app? calibre viewer?
in my own experience some humble bundle books are a bit rough and ready, code wise. e.g. may have been coded as one big file rather than neatly split into chapters
what's the title ?
NB you can't post the whole book here because of copyright but there are ways of posting a sample - bit of a hassle though.
can u try that book in a different app. the edge browser may still open epub on request, or a freeinstall of Adobe Digital Editions will give you another option.
if the book bookmarking fails in multiple apps then its a bad book, if it works in all but one app, then its more likely to be an app issue
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