Last year I thought maybe it happened because the eggs were too close together but then again I've seen many people that have their eggs stuck together and indenting each other much more than that. This year I thought maybe it was the side of the light grate I was using that was flattening out the eggs and causing the deformity but also then again if that were the case all the babies would have the same condition. Plus many people use light grate and you'd think if that were the problem you'd see something like this more often. Does anybody know if the indentation of an egg during incubation can cause the rib cage to curve-in like it has here?