hmmm … well, this is a new one, never seen this posted here. I think you mean one stud is sticking out further, right? The lug nut is the thing that screws onto the stud.
Those studs are pressed into the hub. So if one is longer than the others, there is a cause for concern, maybe it has somehow been pulled out a bit for some reason. It’s possible though that someone has installed a new stud, and it just happens to be longer than the others. Here’s a vdo on how it works, might provide you some clues on what to ask the shop.