If there’s a next time perhaps sight down the fingerboard and see if there’s an upward bend (ski jump) at the body as others have reasoned. I agree that’s extremely unlikely on 14 out of 15 guitars but higher level guitars are not exempt and those that haven’t sold may be more likely to have an issue like that. More likely than every 13th or 14th fret is high.
Still, I’ve never seen that many in one place but if it’s not you there’s got to be a common fault in the guitars because 12th frets do not buzz worse for any other reason.
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