I hatched a batch of eggs last month, hatching began on day 20, only 12 out of 35 hatched, 14 eggs were fully developed, but never hatched, one chick was deformed, one was a double yolk with twins that died about 13-15 days (didn't know it was a double yolk until I opened it). It was just horrible! So I put another batch in, and, as recommended by some of you, I tried dry hatching. Well, it's day 20, and I woke up this morning to 3 chicks. The temperature is set at 99.5. What's going on?