Been noticing the top portion of where the door seals against, seems to be moving inwards during a good hard burn. Done the dollar bill test while its cold (because I dont want to burn up my dollar bill), seems to be a decent drag on it, not as tight as other locations. But under a good fire, I notice a air gap. I'll either have to open and make sure there isn't any foreign material between the seal and the box or just push a little harder on the door to cut this air gap. Is this a sign that the gasket needs to be replaced? Or does the metal move that much during its heat cycles? I just dont see it when I get a smaller fire, even if I get the stove top to the same temperature. I just bought a temperature gun and its reading about 650-700 during a decent burn, because I never believe the other temperature gauge.