Ron,
I'm guessing that this is not just the chamferred edges that you would see on the stock pads, but along the the whole outer most edge of the pad. I'm also guessing that you are worried that either the stop tech pads are chamferred along that edge intentionally or the pad was somehow stuck at an angle when installed, correct? A couple of pics would help, but stop tech would be the ones to answer that concern.
Rotors usually develop a lip on the outer and inner most edges because the pads are usually a bit smaller that the rotor surface. I would be worried about uneven wear on the contact surface.
A picture is worth a thousand words.
P.S. Ron, when it comes to concerns about brakes, I always worry until proven otherwise.