Certain iTunes "matched" albums produce high pitched whine after downloading the "matched" version?

I have been begun using iTunes Match and I have encoutered a problem. After importing two of my "Stargate SG1" soundtrack CDs (http://itunes.apple.com/us/album/stargate-sg-1-soundtrack-from/id28057422 and also http://itunes.apple.com/us/album/best-stargate-sg-1-soundtrack/id285158287), a very noticeable high pitched whine is heard during playback. This is not a problem with my macbook pro as the downloaded file on my iPhone makes the same noise. What is up with these tracks? Is there something I can do to fix it? These copies that produce the high pitched whine were the files directly downloaded after the match (so I could enjoy the higher bit rate). What's going on?