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I suspect it may be ePub3 rather than the more usual ePub2.
My experience with ePub3 is that the file size is at least 10 times bigger, and it has more in common with a PDF than an ebook. (This was after purchasing the second part of book 2 of The Barrow by Mark Smylie on Drivethru.) After kicking up a fuss, Mark re-exported as ePub2 for those of us with eInk readers. It was fine reading it on my iPad, but a right pain on the Kobo.
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