I raised a dwarf. It was bred by a friend and did not grow right. From the time it was a baby it got Proper food, proper caging, but IMPROPER growth. It was either stunted due to incubation at too high temps, or it was the pairing up of those adults.
My friend didn't get more babies from the pair that produced the dwarf and we didn't follow up on the next owner of the snakes. The breeder who my friend bought the adults from never replied to my email questions about if he has seen that condition in any other offspring from his stock (he did reply to questions about buying his babies though)....
If memory serves me right, that dwarf of mine is 5 years old now. It will never reproduce as it could never pass even 1 egg.
If someone is selling the stunted snakes as breeders, I would avoid them. Normal healthy females have frequent trouble with breeding. I can't imagine a dwarf being anything but much more likely to become eggbound.
The dwarf I raised is an amazing pet snake. That's probably the best those snakes at the show will ever be.