It's steam cloud. It's not your rig lol, but it's valve's fault. Just disable it under settings. I used to have the same problem, but I never disabled cloud, b/c I kinda like it.
I tried but the steam cloud option seems unselectable. like it doesnt have description and nothing happens when i clicked it. Is there some way to just delete configurations file and start another one? like in the registry or the directory itself?