Small egg - What does it mean?

[Bigbluefrog]

Today one of the hens laid this tiny egg. Why did this happen?

Today one of the hens laid this tiny egg. Why did this happen? View attachment 3584771

My chickens do this as well. I believe it is because if they are young the body is figuring it out. Now my hens ar 3 and 4 and it still happens. They are healthy and doing well. Just a glitch in the reproductive area