New WSM that I put some charcoal in just to learn to adjust vents for different temps. Later on I hooked up my new Maverick (newer one) and the temp on the lid is 45 degress less than what the maverick is reading. I know most will say go with the maverick, but I was not expecting this much of a difference. Is this something I should speak to Weber about and maybe I have a defective thermometer?