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I agree.I'm sorry to say, it sounds like partial paralysis or a neurological condition.
This could be due to injury, as crested breeds are prone to head injuries. It could also be marek's. however. It could also be a vitamin deficiency.
Here are reasons behind partial or full paralysis: https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
I hope it gets better soon. Best of luck!