I have been running this Gemtech G5t for a while now. It started its use on my PWS MK107 upper and not is run on a custom upper with a 10.3" DD barrel (MK18). As you can see from heavy use the first baffle has been taking a beating. This is not anything new or weird, this is normal wear from use. While I do not count the number of rounds through the suppressor I am sure it is upwards of 5k+.
The blueish tint is from oxidation of the oxidized copper residue and perfectly normal. It wipes right off with some CLP
or whatever other gun lube you want to use.