In any empty smoker the temps can do some wild things, so nothing to worry about. I will suggest to you strongly now, set the temp you want, put some probes into whatever you're smoking to check the internal temp, and never, ever, measure the box temp. Measuring the box temp will just drive you crazy and at the end of the day it will make zero difference. (The only caveat is that it is *possible* for an element or rheostat problem, but those are rare and not really what we're talking about.)
Throw a double thick piece of aluminum foil in the bottom of your smoke box and punch out small holes than the stock ones. This has always prevented my wood from catching on fire which is when most people see a temperature spike.