Running a new Big E on setting 3 with the damper around 3/4" open, outside air kit is installed. I'm getting what seems to me a lot of pellets missing their target in the burn pot thus bouncing off to the sides ( a good handful total ). After a few hours, all the pellets that missed the burn pot flared up which created a fire in the whole ash pan. I quickly powered off the stove and let all the fuel burn. Is this normal or a concern? Is my problem ????? Flue setting?? Bad pellets (LG)?? Little scary if you ask me.