The light would explain it! I've read not to extend their hours of light per day more than 14 hours with artificial light. I can't remember why that's a problem with alreading laying hens, but I know I've read warnings that stimulating young hens into laying too soon could cause prolapse immediately or down the road. A Runner starting at that age is within normal range I think, they are good layers, maybe when you have seven eggs per day to share with these folks it will begin to register how remarkable it is!
I get mixed reactions from people when I talk about my ducks, some are really happy for me and others act like I'm telling them about about doing laundry. To me its like a miracle every time! Sometimes I wonder if some of the joy is tied in with our maternal instincts, but I know there are plenty of men who really appreciate what these birds can do.
Priss I'm sorry but you may be waiting for your eggs until early spring - Calls are definately seasonal layers. But what they lack in eggs they make up for in friendliness, true?