kinked tails can be genetic or they may not. you never know unless you test breed. i pet out any animal with a kinked tail unless i know exactly what happened to cause the kink. many kinked tails in patternless animals or animals bred to patternless are genetic. back in the day patternless were known for their kinked tails.
Enigmas tend to have a lot of kinked tails. I have always thought it to be genetic in a sense. But I agree with robin, you never know unless you test breed.
Kinked tails can be the sign of dehydration, injury, or early signs of MBD. Depending on how kinked it is determines how big of a problem it is. If it's just dehydration it should bounce back within a few days. CGD was formulated so that the geckos do not need extra nutrients (vitamins, live food, etc.) so having a calcium deficiency on CGD seems like a low probability.