What is the temp of your heatmat set at? Also how are you measuring your temperature. If you're using a probe, where is the probe at?
My heatmat is at 90 . And for the ambient temperature and humidy the probe is on top of the aspen in the middle rear left side . I added a cheap temp and humidity gage in the middle and an analog thermometer on the left side in case my thermostats fails someday .