well, these were shipped eggs, but we had a couple power outages, last week and again yesterday- i'm using a brinsea, and usually have no problem- other than wanting to keep checking them, so that will change... live and learn dang it- the other two eggs are under a broody, so maybe they will pull through...Sometimes it's defects in the beak and/or legs that prevents a chick from hatching. Causes include vitamin/mineral deficiency in the parents and low incubation temperatures or temperature swings during incubation. Sometimes if they didn't have enough air cell/too much moisture in the egg still they will pip and drown- the egg will look watery when you look in the pip hole and have a small air cell. Caused by too high humidity during incubation. If you open the incubator during the hatch and it messes up the humidity they can pip and get stuck in their shells and die if you don't assist. Sometimes it is just a weak chick or again vitamin deficiencies in the parents. Not to say you aren't feeding them right, just that they may not be absorbing what they need from their feed.