My wood is less than ideal and I finally got my door gasket fixed so figured i would load up for the overnight burn with some biobricks.... Got the stove loaded up on a hot coal bed and left the draft open full for twenty minutes or so... Continuously checking stove temp I look and see the top glowing again..... Thermometer reads right in normal burn range... WTF?.... Turned the blower on high and closed the draft fully and after 45 seconds or so lost the glowing....but the secondaries are glowing and are burning HOT...is this normal for them to burn this way?.... I've also noticed since I have completely shut off the air the glass is blackening instantly.... Will it clean itself next good burn? Stove is a Hampton HI300 insert.... Thanks.