While searching for any of the level 3 charmers, 2 copies of their original arts appear. It seems that previously there was no issue with this, it was a oddity but had no gameplay impact. Now however, putting any of these second copies into a decklist causes the corresponding card to not appear during the duel. During sideboarding, if the cleanup button is pressed those cards will reappear, causing sideboarding to become impossible to complete due to incorrect deck size.
Those 2nd copies have been removed, but it seems your local card data is out of date and isnt reflecting that they dont exist anymore.
Delete your db and db.meta files in your games Bundles folder, then launch the game.