Yes. When I'm breeding for a certain look or trait foreign genes from a completely different species can give unpredictable results that may not breed true. I've run into this problem before when I was sold a pair of Northern Pine snakes that turned out to actually be bullsnake/pinesnake hybrids. The babies all looked different from each other with some favoring their pine snake ancestors and some favoring their bull snake ancestors and none of them looking like any of their other siblings.