The male shouldn't be sharing the enclosure. He's finished his job and the mom will be much more relaxed without him in her space.
If you're going to all the mom to brood the eggs, double check your humidity levels and temps. Low humidity can mean death for eggs. You want it to be no less than say 65%. I prefer sticking in the 70-80% range for brooding moms. Egg boxes in artificially incubators, on the other hand, need to be kept as close to 100% as possible throughout incubation.
As for the roll out, just place it back in the pile with the others. The mother isn't going to reject it if it's a healthy egg. A word of caution, though.. Brooding moms generally don't like hands messing with their nests and a bite is certainly a possibility.
BTW - that bird egg/baby rejection thing is a myth.. if you find a baby bird has fallen from its nest, you can safely return it to the nest and its parents will be none the wiser. Their sense of smell is very poor and unless they actually see you meddling with their nest and feel it's unsafe, they aren't going to abandon it or any of the eggs/hatchlings in it.
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