We have 3 RIR hens and 1 Buckeye. They are all 8 months. I got an egg last week that was weird. I found it on the floor. It was covered with a thick, creamy substance. It was the normal size. When I cracked it open, it was normal on the inside: the yolk stood up, and the shell was hard. I haven't gotten anymore of these eggs. What happened inside that hen that caused it???