The music clips have merged together

I use the exact same music clip in the program "Ghost Train" and when I drag and drop it in the track, there's 2 other clips merged in with it and I can't undo it. I don't know how I even did it. When I delete the clip that says Ghost Train, they ALL go away and all I hear is the original sound to the video. I've saved and restarted the program and my computer, nothing changes. 

Please help! Thanks in advance!

Meg