Avatar jaw deformity

This has been happening for some time. I don't know what I did to do this, but it seems to only happen to me, and one of my friends said they can see it as well. I've tried switching back and forth between different shapes, but it's still there. Sometimes however, it goes away. Does anyone else have this issue or am I just doing something wrong?

http://img260.imageshack.us/my.php?image=snapshot002re5.jpg

It's unusual but it's been reported before.

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