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@Trenien: The most likely cause for that is a corrupt database on the device. You can check the database to confirm this. If you are a calibre use, my Kobo Utilities plugin has an option to do this. Otherwise, you need an SQLite database management application.
The fix, if you don't have a good database backup, is to sign-out of your Kobo account. When you sign back in, it will create a new database and process all the books on the device back into the database. Unfortunately, you will lose the reading status and bookmarks for any sideloaded books.
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