Right now my only two girls that are laying are my EE and my Salmon Favorelles. I've noticed that the eggs/eggshells from the Salmon Favroelles are much thinner than those of my EE. Two times within the past couple of weeks I've gotten an egg from her with a crack in it. Then, today I found this egg in the picture. It feels almost like a water balloon but it was not cracked in any way. My girls always have oyster shell, although I do not have to refill it often. What is going on and what should I do?