Hallo Zuki,
the problem are the wrong keys Korg expected. e.g. a)C7 = C3+B2, or
b) Cm = C3+Bb2.
Playing these keys Roland Chord Recognition is a) Cmaj7 and b) C7. What do you think about that. Right?
Cmaj7 and more does not exists in the Korg or Yamaha sytem, and the beginner never will learn how to play the right chords. Exactly like your happy player.
Greetings
Peter