I have new offset smoker. A big backyard type. Thermometers on chamber even with upper tray. I put my remote digital on bottom tray 10 inches lower. Lower temp is 40-60 degrees hotter than upper. Is that normal? If I put my digital on upper tray all thermometers read same. Please help or explain. In this picture the temp difference was actually 110 degrees different. Lower cooler than upper.