It may not be, Laura. That was just my first inclination, based on your cook time. Next time you do a smoke, if you have a way to check the box temp, you might want to, just for fun. Certainly not a problem, as long as the smokes are good, but you can actually set a probe offset to account for any error. You can also do this with a glass of ice water, over the probe, to see if it reads 32.