I've had these things for less than a week so bear with me but I check my tanks and they all seem off. I set Lily (my ball's) herpstat to 90 and it was reading at the right temp. and then I held my temp gun on the probe and it read 95. So then I checked Wilbur's hot spot and the herpstat was giving me grief about it being more than three degrees cold but my temp gun says 89.9 all over the his basking rock. (that is the rock under his bulb NOT a hot rock). Peppermint is all squished against her cold side. I only set hers to 80. Am I doing something wrong?