Random game was installed that I didnt get or install myself

So I had a rog ally for a while now and when I cut it on this morning some game called natural selection 2 was installed. But I didn't buy the game much less install it. I went on and deleted it and when I opened steam it popped up in recent games and its like I can still download it. And the activity, your stuff, and community tabs are empty. And when I go to the store page it's like normal and I have to buy it. My ally has a password on it that I only know and I changed my steam password about a week ago and I only know it. Is it some weird bug or something? Thanks in advance.