Three of my 30 hens have been laying soft shelled eggs for a several months now. One is a golden Sexlink (2 years old) another is an Ameraucana (1 year old) and I don't know who the third one is. The Sexlink started laying the soft shelled eggs after molting last fall and the other two started a couple months ago. They have free feed oyster shell calcium. I use Payback feed which is 17% protein and a couple times per month I soak some alfalfa pellets in water as a treat for them. Any suggestions as to what I can do to stop this? I'm getting tired of cleaning nesting boxes on a daily basis & the other chickens usually get the eggs before I do. I definitely don't want them to get in the habit of eating eggs though I'm afraid this is already happening.