Mono mix does not work in Windows Camera

Hi! I’m trying to record with the Windows Camera app on my computer using a UR22C audio interface as the input. I can hear myself in stereo in my headphones and any music program that I use, no matter how cheap, uses the first lane in mono and sends it both right and left after recording. Yet when I try to record myself playing with the camera app the result only has sound on the left or right depending on which line i use (1 or 2, left and right respectively) I’ve tried my very best to mix it into mono in the dspMixFx, but to no avail. I wanted to hear if anything like this is regular and possibly connected to the audio interface. If not I will take the issue to microsoft support instead and ask about why the camera app is weird.