Without knowing whether or not there were fully formed babies in the eggs, we can't really know if there is a possible fertility issue with one of your adults. Sometimes eggs will appear fertile, they will grow (absorbing moisture from the air and incubation medium), but there is never actually a formed baby inside the egg. I've never had a fertility issue with a female, but I do have one male that has never fathered any babies.
I think you have received some good incubation tips from the other members here to help prepare you for next season. A shoebox sized Rubbermaid container with damp perlite as incubation medium and a few tiny holes in the lid at room temperature is what I have always used for crested gecko eggs.
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