Keeping in mind that I am very new to snakes, I have a theory that this is hypervitaminosis c (scurvy) from prey that is also malnourished. What are you feeding? Whole rodents, and not pinkies, right? Are you feeding f/t or live at the moment? If you're buying frozen, I'd personally suggest sourcing your prey from somewhere else -- again, more experienced members can correct me if I'm wrong -- but I'd think low quality prey would be the most likely cause.

I hope you get them feeling better soon.