Repairs 33" troy-bilt mower creeps forward when in gear

I just purchased a used 33" troy-bilt walk behind lawn mower model number 34342. When I put it in any of the gears it creeps forward and also creeps back in reverse. It does this when I'm not pulling on the bottom handle. I took off the wheel drive control rod and spun that to see if that would would and nothing changed.

Is there another adjustment somewhere or could the belt just be to tight? Any help would be appreciated.