Random steam games???? HELP!!

[marfio15]

Hi. I am relatively new to steam, and was wondering whether it is normal to have random games in my library that i don't remember purchasing or downloading, the two games that have appeared in my library are Marvel Heroes and Sanctum.... I am worried that my account is hacked or some other issue :/

 

[edogawa]

It might just be games that were already installed on the system from another account, try running them to see if it lets you play them.

 

[lucuis]

Steam also has free weekends, those games will appear in your library as if you owned them and you can install them and play them restriction free for the weekend.

 

[USAFRet]

I show those same two.
"Marvel Heroes - 22 hours left Not installed"
"Sanctum - 2 days left Not installed"

I believe it is just a push from Steam to get you to install, play, and buy extra stuff.