1 of mine has the air cell perfectly centered on the side. The egg is rather odd shaped & matches on both ends so it's impossible to tell which end is supposed to be up. I set the end I thought should be up but when I candled I found the air cell on the side. So now the other end is up to see if the air cell will migrate to the other end. We shall see what happens when I candle it again Monday. I marked where the air cell is so I will be able to tell if there is a change.That crossed my mind as an option, I joking to my DH that maybe I should -- I'm going to move it to its side now THANKS!