Dota 2, TF2, and Space war appeared in Library out of nowhere?

I've never played any of these games, but they all showed up in my library suddenly. I did a search to see if anyone else had this happen and a lot of the replies seemed to be non answers, the one thing I saw is that apparently space wars shows up for pirated games, which I don't have any pirated games, the closest thing I have is two mods for portal 2. There's also nothing in my purchase history or licenses history about me adding these games to my library.

I just want to know if this is a security concern or if this is just some nonsense on steam's part?