Did you candle all eggs before setting?I do have a question about one of my friend's eggs. It looks perfectly fine on the outside, but when candled, has what look like cracks, but also wider light areas that are too broad and wide to be cracks... And are completely invisible on the outside of the shell when not being candled. What are those? Are they a problem? I must note that my friend's eggs are very thin-shelled. Are those just areas of very thin shell?
Hard to say if those are actual cracks, or maybe 'repaired' cracks...<shrugs>
I'd keep a close eye on them, hopefully they don't start oozing.