It's only the super cinnamon/black pastel's that have issues, not the regular (heterozygous) versions, right?

The one and only super cinnamon clutch I saw had one kinked and duck billed animal and one that looked normal to me. The breeder mentioned that kinking is also an issue with them. I saw the problem one as an adult last year and he looked better than I expected (grew out of it a bit). Not sure if it was related but he seemed to be a mean cuss.

I've heard plenty of reports of breeders having 50% of their caramels kinked. But then I've also read a few reports of breeders with long strings of 0% kinks. I think there has to be a significant variable involved. Many believe it's genetic but I suspect some environmental factor that varies between collections.