Sound stereo problem

Sounds very weird, when you are digging or just moving head when jukebox playing, sounds just going crazy from left to right side of headphones. Seems like when you breaking left side of block sound is going from right headphone ear, and when breaking right side of block sound is going from left headphone ear. And it`s sounds like just only from left or right headphone, not "gradient" stereo sound. p.s. sorry for my bad english.