Scales with inlay on the front sometimes will shrink more on the rear scale than the front.
Also, the front with the inlay will sometimes bulge out.
If the rear scale has shrunk more than the front, the blade would be hitting the front scale. Not the back.
I cannot see any bulging of the front scale with the inlay, so I concur with RezDog.

Of course you have it in-hand and can judge warpage, etc better than we can.
Possibly someone tried to tighten the pivot and bent the pin?