The multiple shelves problem is something happening on the Kobo server. Or an interaction between the server and the device. As Kobo store the info about the shelves on the server, logging out or doing a factory reset will not fix this problem. When you log in again, the shelves will be downloaded from the server. This will include the duplicates.
There are three ways I can think of to fix this:
- Use calibre to delete all the shelves and then sync.
- Manual editing of the database to mark the duplicate shelves as deleted and then sync.
- Get Kobo support to delete the duplicates and then sync. If you do this, they will probably ask you to do a factory reset or log out first. Tell them you have just done this and they came back.
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