When you put a book on the Kobo device, it is processes to extract the metadata. This is put into the database and used in the library lists. The only supported way to change this is to remove the book and add it again. Otherwise, you have to update the database in some manner. The simplest way is using my Kobo Utilities plugin. The "Update metadata in the device library" function will do this for all books in the calibre library and on the device.
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