ahh crap, I forgot Ford use studs. You can replace studsbut it’s obviously a bit harder.
Did they do all 4 wheels?
All I can think is that they were either all put on too tight or they were put on loose or have come loose (I always check wheel nuts/bolts after a few drives when the wheels have been taken off) and it has caused the wheel to move around and damage them and put all the load on the tightest and then the next tightest and so on.
i would be very worried about all the wheels they did and potentially want all replacing. Could be worth giving Ford a call as they might be interested as 4 studs breaking is very serious and could easily lead to a fatal crash. they might be able to give some proper expert advise on why they failed.