Fair Game Sound Problem

[Munch]

I encoded Fair Game Blu-ray multiple times and still had the same problem.
It sounds like the centre channel is low or not even being used. I played the .mkv on the computer as well as streamed it to the TV through a Boxee Box with a 5.1 sound system.
During a rain scene it sounds like the background noise is the foreground noise, so the rain falling and hitting the ground sounds like a big echo (Sounds terrible). When people talk, it is hard to hear as well.
I played the actually blu-ray in Cyberlink PowerDVD 9 on the computer, and got the same problem. But then I played the blu-ray in the home theatre system, and the sound came out perfect.

Any idea what the problem could be?

The 2 different encodes are as follows:

The MediaInfo data for the audio stream for the lossless encode is:
English, 1 561 Kbps / 1 510 Kbps, 48.0 KHz, 24 bits, 6 channels, DTS (MA/Core)

The MediaInfo data for the audio stream for the DD 3/2+1 encode is:
English, 1 510 Kbps, 48.0 KHz, 24 bits, 6 channels, DTS

[Romansh]

The fact that the issue occurs in two different players, playing two different sources (Blu-ray in PowerDVD, MakeMKV's output in Boxee) suggest your computer's 5.1 system might be misconfigured somehow.