Buzz is probably caused by the string when it vibrates touching a fret.
On the simple side of things, did you buy the same thickness strings that were on it originally?
Otherwise, It could be that the string has a little clearance when the string is not in motion, but has contact with a fret when it vibrates... If you press at each fret and there is only buzzing up to the 12th fret, the 11th, 12th or 13th may be the issue. Take a closer look there to see if that is what is causing the buzzing. Also, is the space between the string and neck consistent? or is it bigger in the middle then on the ends?
The issue may be caused by the neck bending a little bit, or the fret being a little too high. The neck may have an adjustment.
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