kana

Hello, I put a sound file (WAV PCM / 96kHz / 24bit / Stereo) into WO timeline and play. Then curiously, in almost 10 minutes play, I hear the Vocal in the sound stands on right side. I paused timeline and play again, Vocal come back to center. I think sound file is correct. When I play this sound file on Media Player, Vocal always stands on center. WO version is 6.1.4. Any help would be appreciated. Thank you.