It's definitely those lights since I can turn it off using K when I switch to light stage 3, however I'm not sure why it can't be disabled by without manual enabling by default.
Nevermind I was wrong, I can toggle it by pressing "L".
I have it disabled, though.
<WRNL LightingFormat="leds" >
<PresetPatterns>
<Lstg3 Enabled="false" Pattern="009" />
</PresetPatterns>