Possibly, bad ID3 tags.
In its playing via the database categories (Albums, Arists, Songs, Genre), the player organizes the music by ID3 tags in the individual files–data in the files that identifies the album, artist, track no., genre, etc. The player ignores the order you put the files in (unless you are playing the files under the Clip+'s folder view). And so, if the tag information is incorrect, the playing will be as well.
And so, even if a CD of tracks is in order in a folder on your computer, as songs 1, 2, 3, 4, 5, if the track ID3 tags for the songs give the track nos. as 1, 3, 2, 4, 5, the player will play the CD tracks “out of order,” following the order in the ID3 tags. Hence, the importance of having accurate ID3 tags.
Info. re ID3 tags: http://en.wikipedia.org/wiki/ID3
To correct the tags: a tag editor, such as well-regarded Internet freeware MP3Tag. http://www.mp3tag.de/en/
