Ok did some reading and it says it's ok for it to be tilted and they are warmed by contact so don't raise it too much. I also found that the average body temp of a chick is 106 degrees. That's higher than I would have thought.
I have never used one but it is apparently adjustable for height as you have one end lowered.Not sure how it regulates the heat but that may have something to do with it getting too hot. I would raise it as much as you can and level it. The chicks don't need to be directly against it and after 3...