So, I went out to the coop yesterday to get the eggs, I noticed that one of them had a strange buildup of cement like stuff on the top. When I washed it I tried to pick it off with my fingernail, and I notice that that broke off part of the shell. We haven't pin pointed the chicken yet, but none of them have been acting strangely. Is this something I should be worried about? I will try to get a pick on here the next time she lays a weird egg. Thanks!