You really need to calibrate that thermometer or buy a couple of new cheap ones to calibrate. Unfortunately thermometers that come with incubators are not usually correct/can not be trusted.We didn't have a humidity meter for the entire incubation period and the thermometer was a simple mercury one. This is our first time incubating and we don't have much supplies other than the bator itself. I was surprised when they actually started hatching since the incubation quality was probably pretty poor.
I know this sounds totally crazy but trust me when I tell you thermometers can be wrong.
Same so a humidity gauge...must salt test it to know just how off it is.
I'm on my way to bed right now but I'll come back in the morning and post links for you with instructions on how to do both of these things.