Too much soot using gas burner

Hello. I am using an Ooni karu 12G oven along with the gas burner.

I wiped the oven completely from any soot, heated it up for 30 minutes, and again it is completely covered with soot, from chimney to the ceiling of the oven.

Is it something related to incomplete combustion? And how to solve it? I can't clean it each day, and clean my hands also from excessive soot 😅