DVD Glitch.

For the first time recently, I watched LV, out of the box set (with the hammer). As I own Oldboy as a stand alone copy, It's only now that I've gone into the box set.

While watching LV, so far into the film, I realised that the voices were out of sync. It was a feeling of the original actors being over dubbed in the same language, but the new voice speaking too fast.

A pause of the movie and a quick google brought up a review on Amazon, where the reviewer said he'd experienced the same, but that he knows someone who owns the set without the glitch.

The film played fine, with no jumps, blockiness, or loss of sound; so looks to have been transferred to DVD properly. It seems odd that only some copies experience this.

Can anyone shed any light?