Hi, That does sound odd. Are you sure the wav files are added to the background music playlist, as opposed to being added as a sound effect? If so, and also if you want to use all mp3, you could convert your wav files to mp3. I've been using a free program called cdex, which has worked well for me. It will convert wav to mp3 for you.
http://www.cdex.n3.net/
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