B string . . . . tuned to pitch at B will most likely be sharp at fret 3 - comes back to pitch (if you're lucky) around fret 7. These are approximations, but it's a tough string for tuning. The "buzz" is mechanical (fret, nut, saddle) - my 2 strings don't buzz, they just are a bear to tune. The guitar is tempered, the music is not. If you've seen a "fan" neck, you'll know to what extremes builders go to make the guitar work.
The best advice is always to get better as a player so no one hears the imperfections of the guitar. I saw Segovia play with gearless peg machine heads and tune on the fly - I've never blamed my guitar since.
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