Most of the deformities are the jaw, and mouth.
From what I hear, many of the people that got them have the same ratio of those mutations.
And they were all approx 0.5" when we got them.
I think it's more likely that the gene pool from a small number of imported original specimens has led to too much in breeding. An adult I had 10 years ago, had a similar deformity, yet not as severe.
Though another theory out there, is not enough iodine in the diet.