Sound issue

So I play on xbox and was playing story mode. I went into my settings and turned on subtitles. That is the only time I've messed with my settings. When I go to play dominion after, it sounds oddly silent. Then I realised that the characters aren't making any noise. Whenever I taunt or execute someone, nobody makes a sound. You can still hear their weapons but can't hear the voices. Has this happened to anyone else or does anyone know how to fix this?