Washer?
There is supposed to be a washer (approx. 2 mm thickness, with splines on the inside) between the two clutch parts. Are you sure this is installed - if not this would explain the problem.
Normally, the clutch nut should be tightened, 70 Nm as I remember.
So, what your bike has is not what it should be.
If you like, can send you exploded view of the clutch showing the parts. PM me.
Auke
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