Splitting videos in Movie Maker deletes most of the project

After editing my project for a while, splitting the videos into smaller parts so that I can subtitle them, sometimes I will get the issue that if I split a certain clip, it will delete most of the project, and soon after my Movie Maker will crash. The part I split disappears, and the blue bar on the left that shows how far into the movie you are skips all the way to the end, signaling that the time has been drastically reduced in the movie.