PIAA Bracket on R1100RT
This is how the bracket is supposed to clear the mirror mount stud. I have a suspicion that the bracket moved just a little after riding the bike. Any movement would tend to pry the mirror off this stud.
The green dots are where the mirror "feet" contact the fairing. It is important to clear these feet. At the bottom, the design of the mirror has some clearance for the bracket, without the bracket having a zig-zag.