Clicking the X on the wishlist page, or the heart on the game page doesn't do anything, and the game remains on the wishlist.

Try clearing the cookies on gog.com.

Try buying them, that should do the trick.

Please visit the following [Add] link, followed by the [Remove] link:
Add - Remove -- Empire of the Ants - Digital Deluxe Edition

This had rectified the issue for two other users, as seen here and here.

Good luck. (^_^)

Gives me a 401 page, clearing cookies didn't help either.

Please, would you post a link to any game (or, add-on content) on your wishlist (as said list is not currently viewable to other users)?

By the way, did you, by chance, already pre-order Empire of the Ants? That is the only logical reason that I can imagine being the cause of the redirection to a 401 error page.

https://www.gog.com/en/game/retro_city_rampage_dx

I've never ordered or touched Empire of the Ants in my life

I've made my Wishlist public for now

Yes that finally fixed it, thank you :)