Modern rings with their varying tooth profiles and lift pins are notoriously "un true". So many stamping steps in manufacturing to maintain flat/straightness. That a lift pin is slightly off is no surprise. If the pin is still solid in the ring (an easy thing to confirm with needle nose pliers) then I would attack it's standoffness with possible grinding of the end. If it's loose in the ring then replace the ring, or live with it. And this pin catching is but one more cost for the current designs we all lustfully suck up to. Andy