I know what you meen now i see it. I have took a couple photos with my phone but cannot upload them at work.
I guess its when they drilled the holes for the plate. In my case Wayside strikes again.
I nerver noticed it before but i guess i just put it down to the angle of that section distorting the light.
Only cure is a bumper repaint

Which i don't feel happy about due to known my luck iot would turn out a paint colour mismatch and broken and marked who knows what.
