Just like not all pairing will produce eggs not all eggs are meant to be, some will die at various stage of incubation than once they do they will start to mold. Nothing you can do it's just nature and trust be it's better to lose your eggs than have hatchlings come full term crawl out and die.
I would assume if you add condensation dripping you would have noticed early on before the point of no return and do something about it, additionally if that was the case your entire clutch would be a total loss by now (water would not likely just drop on some eggs and not the others.)
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