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Still now: on re-fretting (that was almost inevitable).
Ill let you know.

Just for fun, because when I figured it out I laughed out loud...

When I brought my first build home after having the neck leveled and refretted I was so excited to play without the buzz, but when I played I heard this weird resonance, double tones much like described here.

I don't remember how I figured it out, but this was June and it was warm out... so I had ceiling fans running in just about every room. One day I realized that with the fan off it was fine. Never thought about it before but the fan must have been causing air pressure changes in the box as every paddle passed and caused these weird double tones.

A real forehead slap when I realized what it was!

If the fingerboard is flat as a pool table, then that is a problem in itself. It is supposed to be slightly bowed (relieved), as a string does not resonate flat, but in an ark.



The above is absolute BS, don't believe it: A string always resonates in a longitudinal kinetic wave, that is absolutely normal and well established physics! It can't even support radial waves, so whoever "Resolved" it just got lucky, and cited some faux science.

Since it produces more than one note or harmonic thereof (If I understood correctly), which indicates it is not a natural dominant frequency as in something tuned to a specific note, my best guess is that it is the strings sounding behind the fretted note to the nut, off of any or most frets. That is why they are out of tune too. Once you have a proper relief in the fingerboard instead of a flat one, it will go away. The right relief will also allow for a lower action.

If your luthier insists on a perfectly flat fingerboard, then look for a new luthier who knows better.

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If what you see is what you get, then Stevie Wonder ain't got nothin'!

The devil of improperly crowned frets. If this has gone on over several fret changes - maybe you need to try another luthier who knows how to properly level and recrown frets.