Been burning this stove just over a month now; just this last week the stove has been filling the living room with smoke when we go to bed. It was installed brand new in July with a straight chimney through the ceiling of the living room. While awake, there is more opening and closing and poking at the fire. Seals look good, no visible smoke is ever seen coming from the stove and no obvious "smellable" smoke from any part. Is this from too-wet wood? Too short chimney stack? Backdraft leaking....where?