Here's a picture to show what I'm talking about in terms of the head/neck/necklace being off-center. It's pretty slight, but it's definitely not symmetrical. Looking back through Youtube video reviews, I think I'm noticing it on others as well.
View attachment 456612
Mine felt like that when I first opened him. You probably need to adjust the neck piece like I did.
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IMO it's not the neck but rather the necklace that is laying slightly off-center, creating the optical illusion. In your photo you can see it's riding higher on one trap vs. the other.