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Originally Posted by davidfor
With that description, something happened that the device re-imported all the sideloaded books. When it imports a batch of books, they all are imported into the internal database in alphabetical order. I can't remember if it is based on the title or the file name, which for my books will be roughly the same. This means the books all get roughly the same timestamp for "Date added" but it means a "Date added" sort will be a-z, and Recent will be z-a. The "Recent" will change as it uses the last reading date instead of the date added if the last reading date has been set.
Firmware 4.5.9587 has a bug for sideloaded kepubs on the SD card. Whenever books are imported, it will reimport all sideloaded kepubs that are on the SD card. This will mean resetting the date added as well as the reading status. That was my first thought for the problem you described but if it didn't happen the next time you ejected the device from Windows, something else caused the reimport of the books. Usually that means a corrupted database and that needs to be fixed before to long. If you power the device off and these books disappear, or are reimported, then that is the problem. You can also check the database using my Kobo Utilities plugin.
To fix the timestamp problems, the latest version of my Kobo Utilities plugin can set the date added on the device. This updates the database and sets it to one of the dates in the calibre library. This can be "Date" (basically the date the book was added to calibre), the modified date or the date published. That won't give you exactly the date added to the device, but these might be more useful dates and it gives more options if you need to resend all the books to the device for some reason.
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I've ran the check database option, and it finds 2 issues about a cover and cover id. Where in your utility is the feature to update the date of the books on the Kobo?