Duplicate tracks in the playlist??

I have recently migrated all my music files to a new NAS from a windows home server pc. Every album I wish to listen to has each track duplicated. An example is below. Any ideas what I need to change in settings to prevent this happening as its most annoying.
Thanks Blue


Album Artist: ABC
Composer: ABC, Martin Fry, David Palmer, Steve Singleton, Mark White, Mark Lickley, Anne Dudley
Year: 1982
Duration: 75:19
Show Me
Show Me
Poison Arrow
Poison Arrow
Many Happy Returns
Many Happy Returns
Tears Are Not Enough
Tears Are Not Enough
Save Play Add to Current Playlist More
Valentine's Day
Valentine's Day