On the fifteenth of January, I placed 41 eggs in my incubator. 14 hatched. 2 had leg problems, so they died. I did an eggtopsy, and 15 eggs were completely developed, 3 were only partially developed, and 9 were unfertilized. I'm wondering why the 15 CHICKS DIDN'T HATCH???? I took the temperature and the humidity almost every day and have almost everything written down. Everything went well, except that 15 eggs didn't hatch. I don't know what I did wrong.