What could have caused this?

[Ajp23]

This egg feels hard but obviously has some issues. What’s going on?

 

[sourland]

Sometimes it's just a glitch in the egg making process. Other times it can be an indication of reproductive problems to come.

 

[EggSighted4Life]

This egg feels hard but obviously has some issues. What’s going on?

The first one looks "slab sided".

See following link for cool video and information..

https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

 

[Ajp23]

The first one looks "slab sided".

See following link for cool video and information..

https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

Thank you, this is very helpful!