Recording doesn't save multiple audio tracks

When I used to record through OBS on my old PC, I was able to save audio on three different tracks: 1st one would have all audio, 2nd only the microphone audio and the 3rd would be only captured audio, like gameplay.

I've switched PCs and set up OBS again, but for some reason when I record, it only shows the first audio track. I should have everything set up right, since I used this guide: https://obsproject.com/kb/multiple-audio-track-recording-guide, which I used previously as well.

I have the mic set up to record on tracks 1 and 2, and the captured audio to record on tracks 1 and 3. I've set up the output settings so it should take tracks 1,2 and 3. Still, when I put it on DaVinci Resolve, it only shows one audio track. Is it the file format? I tried both .mp4 and .mkv. Or could the problem be on Resolve's end?