Is your door leaking alot or what is your concern with the door?? If you can take a picture of it then we might be able to help you out more. Hey it gives you another excuse if you need to smoke again.
Didn't particularly like the high temperatures mine registered regardless of what I tried. It just frustrated me to a point that I built an Upright Drum Smoker and now use that exclusively. Sold the Smoke Hollow.
Of course there are those on this sight who are expert in the use of their propane smokers and hopefully they will come along to offer some advice.
Most smokers will leak a little smoke frome the door and other areas, but not enough to effect the end product. Have you calibrated/compared therm readings? Some factory therms are way off, if so, replace.