Think it'll just be wear and tear, you'd be amazed at how much the skin will wear away parts that are regularly handled, I may be wrong but I'd think it was this imo.
Is the discoloured one new from funkypower?
Send it back pronto imo. My Mugen one is quite worn now but none of the numbers have scratched, some discolouration on the top though as I'd expect tbh, it's only aluminium
I'm just emailing them now.
Any pics?
Deffo one for the returns bin I think fella, I'm sure Funky power will be cool about it, let us know how you get on