When I candled my eggs most of them seem good. They are dark at the top and I can see light on the bottom third or so. But about 4 or 5 of them have light at the top, about 1/4 of the egg, and then a thick dark stripe, and then the bottom third is light. The ones with the light at the top and bottom, the light is not as bright at the top as the bottom. The eggs are on day 10 right now. Any ideas? Thanks!