Notes F-A-C-E is shown as FMaj7 in the various chord lists I have seen. However, attached notation fragment shows these notes (at beginning of bars 1 and 3) interpreted as F6.

Can someone please advise if chord interpretations are not as fixed as I thought, or if is there a ‘bug’ in the program?

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F_Chords.jpg (288.67 KB, 120 downloads)