It could be one of several issues.

One, it could be your tuner...low batteries could cause the wonkiness, or it could simply be broken.

Another culprit is dead strings...

yet another is that it is picking up vibrations from an adjacent string....which you can remedy by lightly "barring" the adjacent strings so they cannot vibrate.

IF you are in the market for a new tuner, Colin sent me a Snark

http://www.snarktuners.com/sn2_front.html

which is a wonderful tool.


If writing ever becomes work I think I'm going to have to stop