Sorry to hear that. It's strange they would have slits on the bottom of the egg. Are the other eggs leaking as well? Breeding definitely has its ups and downs. My first clutch was 5 fertile eggs. They died off one by one until only 2 were left. The remaining babies survived until they were full term. One died in the egg shortly before the other one hatched. The dead one was severely malformed. The one that survived had severe kinks and could not swallow food. He only lived 3 months. It happens and its sad, but there are so many other good times when you breed snakes. Healthy hatchlings are far more common than weak or deformed ones. Don't let this one clutch (or even the other one) discourage you from breeding snakes.