I’m not able to see the stones well enough on my screen so will go by what Randy is saying about possibly being too long. I think I would do as he suggests and try swapping out with the other pallets you have on hand. If you get the same results then would feel that the stone settings are fine and the problem lies somewhere else. The pallet cock being tilted or off a bit will also cause this problem as Randy suggests. Might try messing with it a bit. There are some other possibilities too. One is too much slop between the hole jewels of the pallet arbor pivots AND hole jewels/escape wheel pivots. Also check for an out of round escape wheel. This is more common than you might think. If you have another escape wheel that you can try might be worth the effort. It’s a process of elimination but you’ll get there Tom!
Good luck and let us know,