first time with chickens. help with "rubber" eggs

[julielaur]

Hi, we have 6 wonderful 7 mo old hens. All are laying. One however lays either really early or in the middle of the night. When we open the coop just about everyday we have a runny rubber egg from one of them. I feed them their crumbled shells in a small amount if greek yogurt and also have oystershells out. Do I have a defective chicken ?
Thoughts would be appreciated from this "green" chicken owner.

 

[Judy]

If does sound like it, if it's consistent and only one bird.

https://www.backyardchickens.com/a/common-egg-quality-problems