When I play stereo audio using WASAPI, I get the same audio in my surround channels which I can't seem to disable. This happens in both TIDAL and foobar2000. When using ASIO or Direct Sound everything works normally and I've also verified that all the channels are correct otherwise.
I'm using a Xonar Essence STX II 7.1 sound card.
Any ideas? I've checked all settings in Xonar Audio Center, Windows Sound Control Panel, foobar2000 (no DSP selected, and also the same thing happens in TIDAL so it can't be a misconfiguration in foobar2000).