Belt too tight

I’ve done some searching around and can’t find what I need. I bought a new primary and put a Heel Clicker kit in it, rebuilt the secondary and put the new HC spring in it. Got everything installed, put the belt on and it sits way high on the secondary and it super tight against the shaft bearing on the primary. When the engine starts its tight enough against the primary center bearing that it causes the belt to turn. So sitting in neutral or park that secondary has a good speed on it. I’ll put it in gear and let off the brake and it wants to roll. I put the secondary back together the way it was before and never had this problem. Do I need a shim in there or something?