i don't think it looks like a 'jag related neuro issue' personally... if i had to guess i'd say it's some sort of damage brought on by illness and/or dehydration or, because it's young, it may have just been born with some chromosomal damage.
i once had a carpet that got a mite infestation, followed by RI. the antibiotics were too much for him... the RI cleared up, but then he started acting exactly like what you're seeing here. he was fine until you touch him... then he'd do what yours does. it was sad because it was my first carpet... a true 'pet' snake.
pick up the last third of his body? is it limp and loose compared to his tightly constricted upper 2/3? if so, then you have your answer.
i'm not a vet, this is just my opinion... for what it's worth.
bottom line, i'd be getting my money back!
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