Yep, just cuz a Leghorn has been crossbred to create other Leghorn colors doesn't mean they retain the prolific egg-laying genetics of the parent White Leghorn. Our Buff Leghorns supposedly were to lay white eggs but we got tinted eggs & not a good layer either.My Exchequer is a nut. She got to five pounds, and she didn't lay eggs every day of the year. She was advertised as being a 3 pound, 360 eggs a year bird. Nope. Josey decided that wasn't good enough for her. She isn't laying right now, and she's at 4 pounds due to a molt.
Crossbreeding muddles genetics.