I am not a hatcher but I have been reading some of the threads.
What I have read is that sometimes, they are just a little early. Also, if the temperature has been a little on the high side, that can accelerate the process.
Have you read the sticky on Hatching Waterfowl? It looks pretty good.
What is your humidity? That is another critical thing, with some confusion about relative humidity versus wet bulb humidity. Many first-timers seem to keep the humidity too high, and that can be a big problem.
