@Nyogirl,
"I check it almost hourly when I'm at home and first thing in the morning and right before I got to bed just to make sure it hasn't moved or any temperature fluctuations or anything like that."
That sounds like no way to live to me. Sounds kinda stressful for the snake as well.
"The way I have this set up with the hot glue mat, which isn't a full sheet,"
I used hot glue once to stick a thermometer probe to the bottom of a cage. It didn't hold long. I've even had super glue fail holding a probe to a RHP.
But maybe I'm not understanding how you have it. Post a pic of what you're doing. I don't know what the "hot glue mat" is.