My spider "spins". The behavior or defect is only noticeable if she is climbing up something. It almost seems like she has a loss of balance. While climbing she will start going up (say up my arm) then as she gets to a vertical surface her head will go back words and she usually turns to go another direction. It doesn't affect her in any way so I have not worried about it. I would only caution that if you have a spider with balance/climbing issues to keep a close eye and good grip on it when its being handled to prevent a fall.
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