Rear Brake Pad, is it too small?

Enclosed are the pictures of friction area on the rear rotors. Now, with the new wheels I am noticing more of the rotor exposed, but what has me alarmed is that the center of the rotor isn't being touched by the pad. Rotors turned and pads replaced about a month ago, there are only 2 conclusions for the rust ring to be so thick that I can come up with. One is that the pads are two small, the other is when they turned the rotor they may have gone over a painted/finishes surface thus exposed more metal to open air rust. Can anyone confirm on their own brakes if this is what theirs looks like, a picture would be cool too...


Thanks!