The problem is with the chord voicings and bass. Open the lead sheet window for the piano and see what is actually there. It's pretty rare for even a basic rock and roll or country tune to have the piano playing simple triads with a root in the bass. A chart that you're familiar with might show a Em7 but the lead sheet actually has a quick b9 #9 movement. If you have two chording instruments like piano and guitar, that just compounds the problem. Just a few major 7th or other passing notes will totally throw off the chord recognition then combine that with a non root bass and you can see some crazy chords. You could have the piano playing a basic Am7/E but the guitar is playing that plus a passing Bb. The program might call that a Emb5sus or something. If you want it right, all you can do is use the automatic chord recognition as a basic road map and edit it yourself.

Bob

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