Are you encoding with TMPGenc in DVD2SVCD? If so, your problem is most likely caused by the bit rate of your video being too high. The only solutions are to either find a copy of CCE to encode with instead of TMPGenc or to use something like MPEG2VCR (
http://www.womble.com) to demux and then use the multiplex option to move the sound forwards or backwards in the mux until you fix it. You may have to do several muxes until you figure out the right value to use.