windows movie maker problems ((burning dvd’s)

I cannot get all the movie clips saved to the windows 7 movie maker video burned to the dvd I have created using the windows 7 movie maker. When I preview the movie maker dvd it only has some of the image clips on it. This is not what I have on the video I created. What happened to the rest of the clips I see on the video I created with windows 7 movie maker? Can anybody offer any assistance. I have ended all listing on eBay and had to refund money to buyers because of the errore on the dvd's. Please, can somebody help??