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Have you calibrated your thermometer? If the temperature is too high in the incubator it could also account for the developement being further along than expected.

Quote: Yes it is possible. Eggs can hold temperature very well and it can take hours for the temperature in the centre of the egg to drop. I have candled eggs that were laid in summer, and only sat on at night and when a duck was only in the box laying and they showed greater developement...