Occasionally I have one that has blood on an egg. If its an option, you may try putting a camera in your coop to see what's going on.I checked the sleepy chicken, i couldnt see anything, but i will try to look again tomorrow. she kept getting fussy and trying to walk away. I will try to get someone to hold her tomorrow while i look. She had a normal looking egg today with no blood. But another chicken had blood on her egg. I think i have a cannabalism issue, and dont know how to stop it.