belt blowing

Hello, So we own a 2012 venture GT, We purchased the sled with 300 miles on it and I noticed the spare belt was gone when purchased. The guy we bought it from played dumb. Long story short 1100 miles now and burned 3 belts. when driven under a normal load this thing will over heat belts...

So here's the video of my sidewinder clutches in operation. Why doesn't the belt come back to the top of the secondary? My brothers sidewinder does the same thing, belt doesn't come right to the top when you let off the throttle. My dealer changed the bushings In the secondary, checked the...