Spiders have a genetic wobble. That looks like a very prominent wobble/corkscrewing. Like someone else said it's "technically" normal for anything with the spider gene (bee's are spider x pastel) to wobble to some extent, that's just a more extreme case. Make sure it eats and drinks normally and it shouldn't be an issue.
Edit: For the mites I recommend Provent A Mite....not sure if it's available in China but it's worth searching for. I'd be more worried about the mites than the wobble.
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