Sound problems in games.

People, the problem is this: in games the sound volume, namely, the speech of characters, I have somehow depends on the view direction of the game character. If you look directly into the NPS, then his speech sounds normal in both ears of your headphones. Should rotate the camera, as it immediately fades and is heard only in one speaker depending on the position of NPS relative to the gg.
I would be grateful for help in solving problems, so it NPS was always the same. Thanks in advance.