The log s are out of place and are impinging the flames.
Vent free gas heater problems.
There s basically 4 reasons a vent free gas fireplace will produce soot like you described.
Direct vent heaters draw exhaust air outside and blockages in the air vents.
Inspect burner pilot and primary air inlet holes on injector holder for dust and dirt.
Shut off the unit including the pilot.
If yours is a ventless heater that burns oxygen from the room try opening the window slightly to increase air flow.
Vent fee gas logs are not maintenance free.
Blow air through the ports slots and holes in the burner.
If you notice excessive condensation on windows and other cold surfaces or in wall cavities that is a good indicator that you don t have enough fresh air to offset the water vapor being emitted into your space.
They must be inspected cleaned annually by a professional gas technician.
Check the injector holder located at the end of the burner tube.
Allow the unit to cool for at least 30 minutes.
The unit hasn t been serviced annually since you purchased it.
A vent free heater can provide that extra needed humidity.