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Ok, I read an article that says the older an egg is, the longer it takes to start incubation. So if you put a new egg in with a week egg at the same time, there will be a lag in hatching time. The older the egg, the longer the hatching time. However this is under refrigerated conditions. The article even told you how much earlier to set the older eggs depending on how much older to get them to hatch at the same time. If kept over at room temp, the lag time will be reversed and the older egg can hatch ahead of the new egg. Not that this is necessarily what's going on with yours, but something to keep in mind.
Ok, I read an article that says the older an egg is, the longer it takes to start incubation. So if you put a new egg in with a week egg at the same time, there will be a lag in hatching time. The older the egg, the longer the hatching time. However this is under refrigerated conditions. The article even told you how much earlier to set the older eggs depending on how much older to get them to hatch at the same time. If kept over at room temp, the lag time will be reversed and the older egg can hatch ahead of the new egg. Not that this is necessarily what's going on with yours, but something to keep in mind.