Just had this yesterday morning! I think it is because they are asleep and they cant hold it in so it skips the part of harding the egg so they think it is a poo so they just poo it out!!
Thats what i think.
HenGirl2002
If you give them oyster shells (you can get them from pets at home) there egg shell should harden. Try that for a month or so and hopefully you should see a change, if not then maybe try something else!
HenGirl2002
P.S. We do that and our eggs are all ways hard and some times they crack easily...