Kobo often doesn't treat updates as the same book. You may buy a book listed under book-title-1, but the update will be listed under book-title-2, which is considered a separate book. As such, you would have to buy it again. It's pretty annoying, as leaving reviews on the Kobo store is pretty pointless. As soon as the publisher decides to update the cover image, Kobo is likely to treat the update as a new book, and all the reviews get wiped out.
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