Forums Bug Reports splay with mp3s + "knocking" sound

I'm not sure what mIRC uses to play back mp3s, I'd thought it called some Windows function to do the work. Anyway, when I play an mp3 in mIRC I get this weird "knocking" type sound, it happens along with the music in certain parts (tends to coincide with the drums) so I guess it only happens in certain bands of the audio. I'm not really versed in audio stuff though.

This does not happen in Winamp, Windows Media Player, or zinc (forgot I even had that installed..). I originally thought it might have to do with the large amount of scripts I had loaded but it persists on a relatively clean (<20 scripts) copy of mIRC 6.03.

I usually use Winamp anyway, but I thought I'd ask if this is a problem for anyone else, and see if it is indeed a bug.

Edit: It's not the same for every mp3; some sound fine, some are very subtle, and some are majorly strange (like the one I was trying when I wrote this post) The mp3 in question is 128 kbit CBR, 44.1 khz etc.

-myndzi