Ok so I have a styrofoam incubator not sure of the exact model. The humidifier is just built in with the thermometer. When I was hatching ducklings it was critical that the humidity was perfect so I guess it's just habit. It's never done this before usually I can keep it stable. I'm trying to keep it within the 50% I'm not sure if just broken. Even last year o was successful hatching 100s of chicks. Not sure why it's all wonky. Should I just ignore it?
I wonder if the sensor probe is loose or what ever the part that is attached to the end of the humidity sensor in your incubator. Good luck finding the problem.