I have one of my hens laying soft eggs. I first thought one of the chickens was an egg breaker out to get just her eggs. I recently realized her eggs are breaking after she sits on them, and they are sometime rubbery. All the other hens eggshells are fine. I do give them oyster shells. It also started happening when the production went down because of the weather. Does anybody have any help. I know which hen it is because of the color (soft blue, the prettiest one).