— Begin quote from “Charles”
None of the other strings have that problem at the 10th as I checked all the others. With same said metal ruler as above, it seems the ruler teeters on the 11th at the 3rd string…although I didn’t think about checking the other strings in the same manner at the 11th.
— End quote
It sounds like there is something is going on with the 11th fret. I’d check to see if it all the way across the fret or just in the area of the one string. Another thing to check is see if the fret is loose and raised, although I more often see than issue on the fret ends. Press down on the fret and see if you can get it to move. Alternately, you can tap the fret with something metal and a loose fret will often sound different than one properly set. Whatever the issue is, it sounds like it is getting narrowed down. Nice job on the rest of the setup stuff. I am glad Dave could jump in with some banjo specifics.