Well it’s not your computer, that looks fine. You could elaborate on your export. I’ve had the same experience on occasion and never did figure out what happened. As a work around you could try rendering the audio separately on your timeline then add that audio file as audio 2, mute audio 1, and re render. That worked for me for a youtube upload where I wasn’t making a DVD. Another time I realigned the audio with the video in ENCORE then made my DVD.
