It's tough to tell from that picture, but is that egg crate the only thing separating the eggs from the water at the bottom of the tub? If so, you might want to add a couple inches of PVC pipe on each corner of the egg crate to lift it higher above the water. If the eggs are just places on the crate, which is just placed in the tub, it could very well be that in carrying the egg box too and from the incubator water splashed up and soaked the eggs enough to encourage them to rot. Anywho, just a thought! Good luck with the remaining good looking eggs though!

Cheers,
-Matt