On occasion, an egg will be missed on the "Fertility Conveyor Belt". It's either that or shipping damaged it enough so that development was stopped at the outset. And I even have another weird situation. After sending out my Lt. Brahma's eggs when she was in the pen with Suede to several people, they werent developing, even though I clearly had seen bullseyes in all I cracked open before that. The Buff Brahma's almost always developed, so I decided to incubate her eggs here just to see what was wrong. NONE would ever develop. I tried two different batches. Seems there is something genetically wrong with Miranda and her eggs, though fertile, just will not develop.
If she says they are fertile, could be something changed. My Delilah, who has been in with Suede for months, is no longer fertile. Could be all that fluff I trimmed has regrown or something is different about Suede's preferences now. Who knows? No more bullseyes, whereas previously, people have hatched her eggs. (doesn't matter, I'm taking her out of the breeding pen anyway)