not sure of the incubator you have, but it is unlikely has a dehumidifier. so setting it to 30% only means "evaporate some water if humidity drops below 30%". If you "dry" humidity is 45-55 it is above 30, so machine can do nothing to lower it.It was 45-55% when I set it to 30% before my first hatch I’m going to call the company I think there’s something wrong with this machine. That’s all I can figure.