I have 5 Rhode Island Red hens, 1 Brown Leghorn hen and a Brown Leghorn rooster. My RIR hens are laying odd shaped eggs. All of them lay these elongated oval shaped eggs. The eggs are long and skinny. My BL lays a regular shaped egg. The chickens are fed egg maker pellets and are let out to free roam 4 to 5 times a week. What is making my RIR lay odd shaped eggs?