Something wrong with Steam (CPU)

[wibus]

hi, I use Steam, and I'm using the applet "CPU Temperature Indicator", and there seems to be something severely wrong.
It's usually showing 50c, earlier I was playing a game on Steam(hours ago) and when I quit Steam, I noticed it was at 70c, which seems fine since I was just playing a game.
Hours later, it's still at 70c, and I figure it's just because it's so warm outside or something. I then open System Monitor and notice Steam is #1 CPU usage at like 20% CPU!
I turned it off and it instantly dropped to 50c, I start Steam back up and it's hovering around 45-50c.
Anyone knows what's wrong? I'm using the default Steam from the Software Manager