duplicating disc

[wb6bna]

This past Saturday I tried to duplicate a Sound Choice disc which has the first eight tracks as regular Karaoke and tracks 9 thru 16 have the vocal parts. When I tried to duplicate this disc I received and error message which said something like you cannot copy a disc that has multiple tracks. I then tried to import the tracks and was able to import 15 of them. The 16th went to about 80% and stopped there. The time on all tracks showed the correct length but track 16 showed 7 plus minutes even though the song is actually about 4.5 minutes. What's wrong??