Aaron Davis

Ok I'm new here so hello I'm Aaron,been a bass player for 30 years...well in that 30 years I've NEVER encountered this issue and I'm looking for some help so here we go....I have this old late 70s early 80s Japanese Pbass I've had it for years,we'll not knowing what I really had I butchered the stock neck in an attempt to learn how to refret a neck I ruined the o.g. neck..SO I searched and searched for a Japanese vintage neck..which I found so I put it on my bass body with some heavy duty screws that aren't really for a bass but work just as well ..they came in this wood working kit thing anyways the issue is ONE FRET DONT WORK..fret 15 just don't work right ..I can get it to work but normal fingerings it gets super buzzy while all the other frets work just fine....I've filed and tapped the frets with a rubber malet..didn't work,the bolts aren't going through the fret board checked that too frets 14 and 16 work just fine fret 15 on all strings work fine but the G string fret 15 super buzzy..can't figure it out for tge life of me ,I've even removed the bolt that's near that fret..any advice lady's and gents?