hey Just wondering.. In my cages I have flexwatt tape under a tile... I also have a helix thermostat. I have the helix set to 90 but it's heating the tile to 104 not sure why. the probe is on the tile so how is it that the thermostat reads 90 but the tile reads 104? what should I do to make sure the temp on the tilE MATCHES THE TEMP ON THE HELIX?