Refrigerator Flame

The orifice and tubing between the orifice and the burner probably need to be cleaned. The orifice is shaped like a top hat. Remove it and soak it in a cleaning fluid like alcohol and blow it out with air. Positively do not try to force anything thru the tiny orifice passage. That will ruin the part. Use compressed air and a small bottle brush to clean the gas tube between the orifice and the burner and blow out with air. Spiders are attracted to the odor of LPG and you probably have some web material in the fuel tubing. This occurs as well in the heat chamber of RV water heaters requiring the removal of the gas igniter and using a coat hanger to drag a small rag bundle thru the water heater heat chamber tube.