I smelt a faint smell coming from my incubator so I went off to see who the culprit was, and the last egg I smelled, Phew. Took it outside and dug a small hole to bury it and cracked it open.... A fine forming chick was inside with black fuzz starting to grow :-/ A pic is below (hope that doesn't offend or gross anyone out! . Not sure what happened (?)...
All the other eggs didn't smell so fingers crossed they go ok.
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Rotten eggs become rotten because bacteria invades. It can happen if you wash your eggs, or if you leave them be. I have tried both. It's sad, but it happens. Even mother hens end up with rotten eggs, so it's not in any way your fault. Bacteria is everywhere.