smurray

Was doing some adjustments on my bike today and noticed something about my rear wheel. I can't seem to get it centered. If I center it in the seat stays then the wheel is off center in the chain stays. If its centered in the chain stays its not centered in the seat stays. It's not so extreme that it's rubbing the frame or anything, but I can tell. Why would this be happening, and is it something that can/should be fixed? I've had the wheel tried recently, so I wouldn't think that was the issue, unless they screwed it up somehow.