We were gifted an auto turner 48 egg incubator for Christmas and decided to try it out with our mixed babies. 48 in, candeling showed 47 fertile. 23 hatched perfectly, 5 quitters after zipping or pipping. The rest..nothing (waited unti day 25). I checked on them often and thought maybe it was the changes in temp and humidity. Cleaned it out thoroughly and a week later we started another 48. This time I decided not to candle at all, our rooster is active lol. So we didn't count our chicks before they hatched. I just moved them onto the rack and out of the turners per normal and waited. We had 25 hatch perfectly (peeked at them only three times for like ten seconds each) and I waited until day 23 to remove them and I found 4 quitters (pipped or zipped). Why are only half of them hatching?! And UGH the smell of dead chicks...horrible! Any guesses or advice on how to fix this?