The most likely problem is that your incubating them to dry. Add some moisture to the incubator by either moistening the incubation medium or placing a small bowl of water inside the incubator and keep an eye on things to make sure you don't go from too dry to too wet(moisture building up on the eggs). Standard incubation mix I use is 1:1 by weight vermiculite/water. Then I'll add water if necessary during incubation by adding to the vermiculite, NOT spraying the eggs. This would be the most likely cause in my opinion since you stated they are fertile. Hope that helps, take care

Paul

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