Game exists in you account

This is a known issue with free weekends and guest passes. All that can be done is for the user to remove any game content they may have on their computer and resync their SteamGifts account after the free period has ended. It can take up to two weeks for Steam to update the user's library to reflect they do not own the game, however. Sadly, this is a problem on Steam's end and we can't change it.

That's exacly what i trought. Thanks anyway :)