Hello! I was hoping someone could tell me what's going on... The last 2 days, I've found egg yolk in the next boxes, and upon searching in the pine shavings I've found the remains of what seems soft shells. I have 3 hens and 2 of them are laying fine eggs. They all eat the same thing, organic layer feed, treats, and they have access to greens as they are free-range. I don't think it could be lack of calcium because the feed has plenty of it. Any suggestions? Thanks!