LG KP500 keeps cutting off random songs.

Whenever I transfer some songs to my LG KP500, about half of them have the first 20 or so seconds cut off. I've tried doing this with all of the possible transferring options but nothing has worked. Even if I transfer it again, that song will still have the same exact problem, and the cutoff length will even be the same.

The files are in .mp3 format. I've checked the songs on my computer and they work fine, and this is with multiple songs.

Also, when I connect the phone to the computer and play the songs from the phone on the computer, it also plays just fine, so the problem can't be with the memory card or the file. Can anyone help?