Perhaps you should try removing him for a couple of weeks and then put him back in with her. Might get some "action" then

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I have a male and female that always produce infertile eggs, but when bred to others the eggs are always fertile. There was some talk a long time ago about locale specific mating with leos, and how certain geckos never produce offspring together.
Sounds like the eggs were infertile, not a faulty incubation system. This year I used a styrofoam fish shipping box filled 1/8 full of damp vermiculite (to maintain ambient humidity) and used the normal deli style cups to incubate each pair of eggs and had a 100% success rate. No fancy incubator needed!
Julie