jeeze.. that's a weird one.. lets see..
Take the left side belt cover off so you can watch the variator. On the center stand, rev the engine up.
Does the front variator unit close as engine speed increases?
Does it close all the way so the belt is riding near the pulley's edge? (maybe 1/2 inch (10 -12mm) from the top edge)
Go for a test ride on a flat road .. look down at the front pulley while driving.. Don't hit any cars or people or trees..
Does the same thing that happens on the center stand also happen on the road?