I’ve just checked the eggs and unfortunately found both of them moldy,even so they were in separate containers. Those are not my first eggs actually, I’ve had around 8 of them for the last few years. The longest one lasted for 62 days and even hatched but couldn’t breathe properly and died in a few minutes,I tried my best to help him but he was just too weak. I have male and female leopard geckos,just two of them,and a home-made incubator with humidity and temperature controllers,so the amplitude of humidity changes is 2-3%,and for temperature it’s 0.5-1°, but eggs always get moldy by the end of the first week, I’ve tried different substrates and incubator construction but nothing works. Maybe someone can share some advices or their own experience, I’m just so lost now 
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Questions to help figure out the issues:
Have you been pairing the same two geckos this whole time?
If so, what are their genetics?
Were they purchased from breeders or elsewhere?
What are the temperature and humidity you’ve been incubating at?
How are you measuring and controlling the temps & humidity?
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Definitely would need some extra info on how your doing things. The questions Noodlehaus asked are a great start.
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