RiggsMcClane
Super Freak
You have nothing to worry about. All the suits have some level of printed on (checkered pattern-like areas/small spots) dark weathering; which is exactly what you have. I'll be it, the area on yours is a bit more than most; but I can say that my Ray came with heavier and more spread out weathering than Peter. So basically, every single figure is unique in that reguard.
That was my thinking. Just some random pattern printed across a roll of cloth. So some will be more pronounced while others wont.