IDVD VERSION 7.1.2 BURNING ISSUES

I HAVE DONE A VIDEO PROJECT IN IMOVIES AND SHARE/EXPORTED IT INTO IDVD. THE PROBLEM IS WHEN I HAVE BURNT PROJECT TO DVD PART OF THE SOUND ON THE FOOTAGE IS MISSING AT END. I HAVE CHECKED PROJECT BEFORE AND AFTER TO SEE IF IT WAS MY MISTAKE. WHEN IVE CHEACKED PROJECT THE SOUND IS ON FOOTAGE.