I have a question; so in my recent silkie hatches I've been able to mark the eggs I put in the incubator by which hen laid them. My problem I'm noticing is that one of my blue silkies, Jewel, is not having any fertilized eggs. I don't think there's too much fluff back there because even when she was molting she was laying and there was no extra feathers to have prevented fertilization. I know the roosters are doing their job because all my other girls eggs are hatching. What could the problem be?