Possibilities:
Damage in the egg caused a neurological condition (temp spike during incubation).
Overheating caused a neurological condition
Genetic defect
IBD or other virus that affects the nervous system.
If the snake is reported to have had this condition from hatching, and you're buying it from the breeder, it's not very likely to be the result of a disease. If the origins are unknown, be very wary. Quarantine for 12 months.
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