my ball keeps burrowing beneath the carpet in his viv. any ideas why?

[Rikoku]

the reason i use them is to make sure he can't burn himself if he burrows himself directly onto the glass. any suggestions for moving away from carpet? thank you for the input!

If you are using a thermostat like you mentioned, then there should be no risk to you snake if its directly over UTH on the glass as it should not get hot enough to burn them.