Heat is not evenly distributed, when dials are set between low and medium the temperature still gets up to 600 degrees. Is this normal? I was cooking steaks and thought I was ok with that setting but the grill was to hot and caught fire inside. I have used weber grill in past and my previous one this never happened until it was on its last leg. Let me know what im doing wrong or if it sounds like there is something wrong with the grill? Thank you