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I would copy the song to a new one, then remove one track at a time to see if it is associated with the track.
Have you tried creating it as a new song and moving the track over?
Sorry... I'm not sure what you mean by "I probably have someone else by now".
I'm not sure why it would do this to only one song in light of the testing you have done. I am going to open the question to other Experts to see if they have any ideas.