I just checked out my library of games recently and saw a game titled UNKNOWN GAME. What is going on? Anyone else see this in their library?

Mind the floor clowns.

Have you tried https://www.gog.com/account/refresh recently?

It's the goodie you got after claiming Warhammer Skulls Digital Goodie Pack. I'm sure you can also see Warhammer: Shadow of the Horned Rat in your library. The store page says the game is included in the pack but they actually came seperatly into you library.

When I click on it, there's no goodies though. There's nothing. For some reason, I only see this in GOG Galaxy and not on the website.

Nothing? Strange. Turn to its Extras page you should see goodies availible for downloading. If you saw the extra page was empty, try go to other pages then go back to it, or just leave that page open and wait until everything shows up becasue this problem happened to me very often. Anyway take a look at the picture I attached, the Extra page should look like this.

eidt: uploaded the other pic to prove the Unknown game came along with Shadow of the Horned Rat.