ripedar: I recently bought some titles from wishlist. Leaving there only one game. But in client it says 2 instead of 1. And there is only one game in wishlist when you click it. On web page all is ok. There is just 1. Ofc I turned it off and so on, even restart and I also waited few days. Nothing helped.

Ice_Mage: Log into a web browser and view your wishlist.json.
...
https://www.gog.com/user/wishlist/remove/2003063833

Ice_Mage: Log into a web browser and view your wishlist.json. If your wishlist is lengthy, hopefully you use Firefox, which will automatically display the file in a readable format. With other browsers, you'll probably want an extension like JSON Formatter.

You can look up the product IDs in the wishlist on GOGdb. When products are removed from the store for various reasons, they become stuck in the wishlist file, although they're no longer visible on the wishlist page. If you have any such items stuck in your wishlist, you can get rid of them by loading the link below, replacing the product ID with the one from your wishlist:
https://www.gog.com/user/wishlist/remove/2003063833

If everything is in order with your wishlist file, then the problem is probably with the local GOG Galaxy database. It's probably not worth the effort to start with a fresh database for something so trivial, but I can post directions if you want. You can click the cogwheel in the top left and choose Report a Bug, for whatever that's worth.