Wolf note or not?

[Richard Prowse]

When I play the Ab on my E string up an octave (the note that would be played on the 16th fret of a bass guitar) is surges - like a wobble. Is this what they call a wolf note?
I put on a little device that I bought years ago that is supposed to deal to wolf notes. It's a little piece of rubber that 'clips' onto the string (between the bridge and the tail piece) and is encased in a cylindrical piece of brass that is held in place with a screw.
The little device so far hasn't fixed the note; I've moved it up and down the string.
Any advice appreciated.