I think they became deformed by whatever adverse conditions killed the other ones. Either that, or it could be nutritional (lack of calcium or vitamins).
Some juveniles have problems with spine curvature. in my experience it has been a small percentage (less than 1%). I'd guess nutritional or husbandry problems. What were you feeding them and how often. I have seen people recommend food on this forum that would be inappropriate for hatchling and juvenile axolotls. One food that could cause problems is using liquifry as a staple.
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