LadyJazzer:

- try setting the fadeout to (say) 4 bars and see if you get the same thing
- open a brand new blank song, use the same style, put in a few chords, fadeout - still have the "whack"?
- try the original song with a different "RealDrums" and see what you get

If you still get the "whack" with all of the above, then there could be something amiss in your song.
Sometimes I've had to copy the chords to a new blank song and save with a new name.

Good luck!
LLOYD S