The guys are talking in the house close by. When i am outside in the garden, i barely hear them.
When i get inside the box in the garden, i hear them better because the sound has some kind of echo like people talking in a closed bathroom like they are with me in the box, but the sound is still coming from the house.

It is like the game is applying sound effect surrounding the player to everysound, even the one coming from outside of it which is unnaturel. Only the sound playing "INSIDE" my box should have that feeling, not the sounds coming from elsewhere.