Hi jmseiver,
Are the notes incorrect against the recording of "Stars" or are they not correct intervals for the diatonic mode that you have selected? If the notes are modally correct, then the harmonizer is functioning properly.
I have noticed is many songs that harmony lines do not always follow the same interval throughout the entire phrase. I am not familiar with "Stars", but The Scorpions "No One Like You" harmony line changes from a third to a fourth in a couple of places. If that is the case with "Stars", you can achieve the correct harmonies by setting an expression pedal to adjust the interval of the harmony. In my case, I set the toe up position of the pedal to up a third and the heel down position to up a fourth. When the interval changes during the line I just change the interval with the expression pedal.
I hope this helps.
