So i was loading my bike into the trailer last night to take it away for the weekend, and I heard a noise coming from the belt area. Bike is completely off and not running. It seems that when i push the bike in reverse that the belt starts coming off of the pulley where the tensioner wheel is and starts rubbing on the pulley cover. Almost makes a sound of an old wooden roller coaster pulling up the first hill. Not sure what could cause this. I have over a couple hundred miles on it since I removed the rear axle and everyhting still seems tight and straight. It runs fine otherwise. Any suggestions?