Getting Extra Frames in Movie Maker

I am creating a quick reel of different shots from several different movies.
I have imported the chapters as .vob format. When I play the clip it seems
to pick up a few frames from the following shot. When I scrub through or
pull the time slider in the viewer I do not get the extra frames. When I
split a few frames off the tail of the shots I still get frames from the
proceeding shot. Any ideas on how to resolve this? Thanks.