Hi. I have 3, 1-year old LegHorns. They used to lay without issue but now Dolores, my smallest one is often laying rubber eggs, getting a shell stuck after passing the yolk and in between it all she lays normal eggs. Well normal in the sense that they are shelled. they have always been porcelain thin. now, since the first rubber egg, when she does lay a solid egg it has a wrinkle on the shell. its a raised wrinkle that is the same each time. could there be an internal issue? she otherwise seems fine. i feed all my girls good layena, they free range and eat grasses and plants, i give them yogurt in oatmeal with honey every morning. they also get oyster shell. i do notice that Dolores is often picked on and probably gets less to eat for running away from her sisters. i hand feed her mealworms and yogurt with apples in the morning sometimes. we also love to go earthwormin' in the garden now and again. she is a great little chicken and i love her for her spunk. i wish she' smack the others when they pick on her.... keeping an eye on them all. but for the soft eggs and the random stuck shell.... i am worried she will never be 100% again. I give all the girls a vitamin boost in their water too. I haven't tried Apple Cider Vinegar yet. figured I'd let the booster make its way into their routine.