OK mine is definitely different. I have a small buzz that shows up occasionally from the audio in my left cup. It comes and goes, so I'm wondering if there is something in there that is causing the issue. I'll have to take off the pad and take a look inside.
Starting to warm up to the sound of these though, and the comfort is seriously out of this world. They are even with my HD600s, which I can wear literally all day. The only comfort weakness they have is inherent to being closed cans, and that is heat, though I haven't had much issue with that as of yet, but I know it will be there when they are worn in a warm environment. I can see how the mesh could be itchy for some people with more sensitive ears, but my ears touch it and I have no itch issues at all.
Could be a driver wire, it supposed to be attached to wire holder clip on the cup, could have come loose, I'd put something sticky in there to hold it better, or just dynamat the cup that will kill the resonance altogether.