I had one female ancona that something got a hold of through the kennel they are in. Not long before this I put two of her eggs in an incubator the model in the picture below. The babies developed alright but didn't hatch they died 6 days before the time I had calculated for them to hatch. Upon opening the eggs they looked like they had fully developed to me but still had the yolk sacs. Can anyone tell me what happened did I have my incubator set too low. I had it a 37.5 Celsius. I had seen one had stopped moving the second to last time I candled them should have I opened the other up when I noticed the one had stopped moving