Even calibrated I still have a 2ndary calibrated thermometer/hygrometer in there. Where the 360 spins there are hot and cold spots. The main thing is you want the average temp to be 99.5F since each egg will have time in the hot spots and cold spots which is fine as long as not too hot that it...
do you have a calibrated thermometer/hygrometer in the incubator? it may be that the temp is now off and you need to calibrate the incubator so that you can set it at the correct temp and that is what it is (you can look up how to calibrate the NR360 if you don't have the instruction manual)...