One of my hens found this rubbery, soft, broken, empty egg shell. I have no idea which one laid or passed it. No one is acting noticably different. Except my jerk rooster but that is another issue. Only a few of them have started laying and they just started last week. All the other eggs have had really hard shells so far. We did have a raccoon attack last Friday. Could the stress have caused something like this? Do I need to be watching for anything?