Any update? Mold will also grow on eggs that are dying or dead. Hopefully that's not the case here.
Ball python eggs like a lot of humidity when they're cooking, but actually sitting in water of any sort or water dripping on them can quickly kill them.
May I suggest some substrateless incubation? It's easy to set up, and difficult to mess up.
Basically, set eggs on some sort of device that keeps them up off the substrate and out of the water. A lot of people use lighting grates, plastic "eggcrate". Plastic craft canvas, you know the kind with the holes for stitching, can also be used as long as whatever it is is stable and your eggs won't move around on it. Underneath can be nothing but water, or you can use some substrate. Vermiculite, perlite, aquarium gravel, marbles etc.