I just purchased a 1969 Les Paul Professional (low impedance pickups).
It plays very nicely. However, on the 22nd fret on low and high E strings,
it plays the same note, same pitch, down about 3 or four frets. Then it
sounds the regular notes for those frets. I figured that this was an intonation
problem. I was planning on bringing it in for a setup. No problem, right?
Curious, I took a phillps head screwdriver and opened the truss rod cover.
Upon removing it, I noticed a brass nut that looked like it had been adjusted
at some point. But then I also noticed that there was what looked like a hardened
opaque adhesive under the nut. It looks like its been there for quite some time.
I didn't dare try to adjust it. I've seen a few truss rods in my day, but I've
never seen this before. I spent over $1300 for this guitar. I'm scared.
Any help on your part would greatly appreciated.

It sounds like the fretboard may be warped. What's happening is that even when you play those notes behind 22, the string is still resting on the 22nd fret.
I'd say get a pro to check it out. Especially since you're out the price of a used car if you screw it up.
Quote by franz.d.
What to change the band name? No way!! We have a kick-ass logo of a washing machine eating guitars and everything!!

Quote by elvenkindje
Lol, when I'm bored I'm gonna try that with regular dice! If I'm famous I'll thank you for it