"Eating their eggs is a sign of a failed nesting. What it means in your case, you will have to find out. But from what you have said, they are not taking to your nests. That is, they do not have the ability to MAKE their own nests. Which from my photos you can see they know how to do. When females "think" they have a failed nesting, and/or the eggs are not viable, they will consume them."

Sorry if this ticks you off but I agree.
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“Nothing is at last sacred but the integrity of your own mind.” Emmerson

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