Voice Chat Settings not Saving

Every time I edit my voice settings in Garry’s mod so that people can actually hear me. Every time I open my settings after changing the setting it back to what it was before. Open the settings, turn up the transmit volume, click apply, click ok, go back into settings, settings are back to normal. I’ve already tried it with another mic and tried reinstalling Garry’s mod. Any idea what might fix this?