Just adjusted the truss rod on my jazz bass and something odd happened. When I pluck a string my fiver usually keeps going and lands on the string above it as a rest. Now when I do this I am getting weird harmonic overtones from tapping the string. Almost sounds like I have some kind of octave pedal or ring modulator going. Any ideas what this could be? Didn't have the problem before adjusted the truss rod. Jazz bass strug with D'Addario chromes. Thanks!