I've got a weird problem with my Far Cry 3. I play on the headphones and there is no "front sound". What I mean, is when someone or something is directly in front of me I can't hear it. Only when I turn camera in the way that the sound source is on the side, I can hear it. Something like there is no 3d sound enabled. Do you know how to repare this issue?

I have enabled stereo option anywhere I could, and nothing helped.