Two of my best layers (both seemingly happy and healthy bantam Wyandottes) produce eggs which when you crack them, about 1/3 of the whites remain adhered to the inside of the shell. I use my finger to scrape the rest of the whites out of the shell halves and they readily plop out. I got these birds as year old birds. Does anyone know what might cause this? All other 6 hens produce normal eggs... They range about 2-3 hours per day, and the rest of the time they are in a large pen attached to their coop. They are fed layer pellets and occasional vegetable and fish table scraps. Their eggs have always been like this. I'm sure I read something about this when I first got chickens about 8 months ago, but I can't for the life of me find the reference now... Any and all help would be much appreciated!