Someone’s breaking eggs

[I dig chicks]

So for the past couple of weeks one of my chickens has been breaking eggs. I added some new ones in the spring and one ended being a rooster so I suspected him. I already have another rooster. But I separated him today and just happen to walk in on one of my older hens in the middle of breaking one. I’ve had the older hens for 4-5 years now and never had this happen before. So I’m wondering why? Maybe she’s lacking calcium?? How do I stop this?

 

[NorthwoodsChick]

Two Crows has a great article that gives a few pointers on egg eater management.
Here’s a link. https://www.backyardchickens.com/articles/nest-boxes-101.74585/

 

[rosemarythyme]

Are all the eggs being broken, or specific ones (like, do they have thin shells and are maybe cracking as they get laid?) If the shell strength isn't an issue, fake eggs might help (they'll peck at them, and not get any pay out) or consider roll away nest boxes.