Output is streched

[SolsticeSpectrum]

No matter what I do if I change the width of the video output in settings, or I check/uncheck the "Keep aspect ratio" setting, the camera width always stays same. It always stretches to some width which I don't know, the only way to somehow fix it is stretch the app in the viewport vertically so it is something like this, changing width of the video output does nothing to mitigate this.

This does not happen with the official built-in virtual cam