HTC SDA (USA) / SP5m (Tornado)

My phone is set to vibrate, then ring. Within the last two weeks, the (Mystic) ringtone sounds very distorted. When I go into Sounds and listen to the different ringtones, they all sound normal. I have switched to the T-Mobile ringtone and it sounds fine, but when I try to switch back to Mystic, it is distorted again. Could the file be corrupt? Are there different files to select the ringtone (Mystic sounds fine in the selection menu) from the actual ringtone file?
Also, music sounds perfect when played through the speaker.