I'll be honest, im thinking nothing is wrong and your not familure with how to regulate the Herpstat.. My Herpstat Probe created a Air Pocket under the UTH and it is not as HOT there as other parts of the UTH so i have to set the Herpstat to 96 at the Herp probe spot and that is acually 91 above the glass at the Hotest soot of UTH. If you check the Hotest Spot of my UTH Itself its actually 101.....
Dont compair herpstat temps to your thermometer temps, that wont work.. Set the Hepstat to whatever gives your Thermometer a hot spot of 90 degrees no matter what the Herostat says.. Also make sure you set it to DIMMING as the Pulse setting made my temps climb to high... Also set your Herp alarm to 5 degrees H&L of whatever you end up setting the Herpstat to that gives you a 90 hot spot and turn Sound ON so you can hear the alarm if it gets to hot.....
If your reading this and Im totally wrong about whats going on then i give up, sometimes communicating and writing back and forth ends in more confusion than help hahahahha.