I've never seen the glitch occur on a sideloaded book, just when its downloaded from Kobo Store.
I've tried deleting and re-downloading the book, but the messed up graphs/time remains. I have to delete it from in Calibre (which removes it from the list of downloadable books) then repair account so it comes back.
I thought about trying to repair the ToC with Kobo Utilities but I'm not sure how that would work on a non-sideloaded book.
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