My OEG hen's eggs have always had unusual air sacs. The worst one was like a V shape. Usually they are down the whole side of the egg. She was brooding on a total of 15 eggs. I took 5 away around day 7 because they kept getting bumped out. Out of those, 3 developed, with one live hatch, one dead pip, and one quitter around day 14 or 15. The other day I took the remaining eggs away, on day 23. 4 of the 10 were rotten, and the other 6 were at various stages of development. One was pipped already when I brought them in. That chick zipped halfway around the shell and died. Last night another one pipped, and it hatched just fine, but now it seems like it can't see? Neither one of its eyes look like they are developed right. One is open too much and the other is not hardly at all. Of the 4 remaining eggs, there was another dead pip, 2 quitters that had absorbed the yolk and everything, but never pipped. There were 2 that were not even close to being developed (on day 24). They seemed like they were around day 16 in developing. One was alive, but died when I decided to open the shell and check the remaining eggs, and the other had died, but was alive when I had brought them in the night before. What is going on?? I know that it has been a bit chilly here lately, but not that cold! She is the only hen that has eggs with so much trouble. I have no problem hatching eggs from my other hens.