Amost every tire shop has done this to me, usually just one at time. I rotate my own tires now. Its from them using an impact driver carelessly, its not nascar and the subaru threads can't handle that much torque. I hope you make them pay for taking short cuts. That's about the worse case of it I've seen, looks like they were going for a record time pit stop. I never take an impact wrench to my Subaru, except maybe to initially take the wheels off and pull the hubs off.