I've seen some people post about this same deformity in hatchlings in the past. Unfortunately, no one seems to know exactly what causes it. Even more unfortunate, but hatchlings like this don't seem able to eat on their own. It's a terrible situation to have to face with a shiny new clutch, but you may end up having to cull the deformed babies. Assisted feedings their entire lives is a terrible thing to subject a snake to.
Very sorry this happened, I wish you the best for the hatchlings still in the egg.
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