Hi, Two nights ago my hen went in the nesting box instead of going up on the roost. In the morning there was this weird rubbery thing and some egg yolk in there. The hens all acted fine. Then today I went to gather the eggs and in a mating box was another rubbery thing. I took it and opened it up and you could see almost like a piece of egg liner. All the pics are below and taken in my hand. Does anybody know what this is and why it happens and anything I can do to prevent it? Thanks!