[img:left]http://s61.photobucket.com/user/sktt1209/media/Mobile%20Uploads/20160729_181356_zpsmyjmuecl.jpg.html[/img]

It looks to me that there is a small shoulder on the stud without threads. Is it possible that the lug nut bottomed on the threads before the wheel was actually able to "center up" on the studs using the conical lug nuts?