Brake Drum Hub Assembly Mystery

Can anyone tell me why the right front lug nut studs are crimped at the drum. I have two vehicles and both right front lugs are that way. The other three wheel lugs are not that way. One Mopar guy told me they did that at the factory on purpose to prevent it from falling off on the assembly line. That does not make sense to me. Brake Drum 2.jpgSee pictures

Brake Drum 1.jpg