odd egg

[Racsan]

Im not sure if I have a problem or not, every so often (twice a month maybe) I get a egg like this, its solid but fragile, contents normal. Does worry me a little. All the birds have access to grit and oyster shells, feed is “rural king layer cumbles”- $12/50#. Im not sure which bird it is, I just know its not my easter egger or the bantam. Heres the latest egg, was about 2 weeks ago. ouch!

 

[nuthatched]

It's a corrugated egg.
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

 

[Eggcessive]

Have you ever seen any sneezing in your chickens that occurs all day long for weeks?

 

[Racsan]

No, all the birds seem happy, healthy with no issues.