Burning DivX Video -> Sound/Picture issues

Using Nero Vision 4 to burn 4 DivX videos. Problem I am having is that when I burn it, when I play it back, on one or maybe two of the videos on the DVD it is playing the sound back about 1 second ahead of the picture. However don’t understand why it is doing this and not on other videos on the DVD, all videos are the same size and same rate. Is this a known issue? Is there anything which can fix it?

Only explanation I can think of is that before burning it says cannot fit all onto disc so it makes it an extended play DVD so it can fix it. But surely if this is the case it should effect all the videos on the disc…not just one!?