That's very odd. You can try another burning program called ImgBurn.
It is free to download and use. Here is the guide for burning dvd video files to a single layer dvd. http://forum.imgburn.com/index.php?showtopic=4632 Since ImgBurn now starts up in EZ mode, just click on Write Files/Folders to a disk and that will take you to Build Mode, which is the start of that tutorial.
By the way, the movie is small enough to fit a single layer dvd I hope?