Have you checked the date and time on your Kobo? If the books sticking to the top were last opened when your kobo was *forward* dated, you can open those books again to reset their last opened date/time.
Also, if you connected to kobo to PC to add books, be sure to try rebooting the Kobo. Due to recent firware bugs, it's very likely that the Kobo has lost connection to it's database and is no longer able to updated it until re-started.
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