Wheel Vintiques Steel Wheels ?s

My own personal thought on this , I think after stamping thousands of wheel centers , the stamp for the small bolt wheel center is getting worn , so the nubs may not deep enough to hold the factory dogdish caps. Also the factory dogdish caps may have become stretched ( because of being taken on and off ) enough to not stay on as well. I know some of you have caps that have been barely used , so they may do a better job staying on the steel wheels.
PS... I have ran into the same problem with a few ( very few ) of the big bolt pattern steel wheels....

Frank