If I have it correctly, the default key for your tune is correct but the chords are really for another key. For example the default key is C major but the chords for the tune are in Eb. What you need to do is edit the tune, then in the editor, touch the key with the i within the circle (the Info key). On the key line, touch the ">" and set the key so that the chords are correct for that key (in my example, set the key to Eb). Then set and transpose the key to the desired key (in this case, C major). Finally, hit save and then done. That should fix the problem.