I don't think it's fading, it peeling. You'll discover that if you touch it with your fingernail, parts can peel off.
Anyway, mine have it too (after only 3months) and they are not counterfeit. Once they start looking bad, I'll likely just rub the rest off. I'm planning on keeping these for a long time and I'm more interested in what comes out the other side of the cups
Thanks for clearing that up. Since I read the post and noticed this on my pair I was wondering how that could happen. Mine are certainly genuine also.