Well, I'm only on day 4 with my duck eggs, but my incubator's temp is fluctuating and the humidity keeps going down. I think our drafty house and running the heaters all day, might be causing issues. I wrapped the incubator in a towel to help insulate it. I really hope this works. I only have 6 eggs.
On my first hatch I figured out my temp and humidity fluctuations were largely due to my automatic thermostat. I payed no attention to the fact that my house went down to 65 degrees at night and only up to 68 degrees during the warmest times of the day. . It wasn't until day 15 that I realized why I was babysitting the Bator. Not sure if this could be a factor but just a thought! Lol.
I'm sure at this early point they are fine.