More then likely that the cover is causing the problems pal, however a couple of area's looked like something quite coarse had been rubbed on them,
I have a confession to make, I'm not sure if you had seen the flakey paint that was on top of your rear bumper, in the join under the rear quarter, when I was polishing the car I just thought that it had to go, so I got a plastic scraper and it came off a treat until I got to one bit that left a line of white primer, so I will now be painting that part of the bumper as well,