Audio Direction Bug – voice lines are too quiet unless facing the source

I discovered an odd bug. I have to face the direction where the sound is coming from in order to hear it properly. So, I have to look directly at my ally to clearly hear what the legend is saying. If I’m not facing that direction, the voice line becomes really quiet. 
I played yesterday, and everything was fine, but today, I have no idea what happened. I didn’t change anything in the game settings or my PC settings. I tried repairing the game, but it didn’t help. 
I’m attaching a screen-recorded video from Outplay as proof. Can anyone help me solve this problem? I would be really grateful!