Video works at 25 fps but not 60

When exporting at 25 fps it exports perfectly but at 60 fps part of my video is cut out and the background music is misplaced. All the video clips used are 60 fps constant frame rate and I have no idea what could be causing this problem. Any help is appreciated.

You should have used one of the video clips to start your project so it would have been locked in at 60 fps, but instead you may have used an image or audio file. Alternatively, set Settings > Video Mode to something 60 fps to start with. As its stands, all your edit timing is based on 25 fps and 25 is not a factor of 60, so the conversions are introducing errors.