I have been incubating eggs and having quite a few hatching from the small end of the egg. Several eggs that did not hatch I did post mortems on the egg and found full developed chicks with their heads pointed back to the small end of the egg. I let my eggs sit for 24 hours with the big end up before putting in the incubator big end up. The incubator is a Genesis 1588 with he 1611 egg turner. Temp is set at 95.5 degrees. Not sure if the egg turner need adjusting or they are growing too fast and getting to large for the egg??? I've had this problem with several breeds, my own eggs, and shipped eggs so its not the chickens. It seems like maybe 25% of chicks of the are either pipping from the wrong egg or egging stuck all together. Any thoughts would be appreciated.