You can try a few things;
1.) Try opening it and rubbing the metal plate more it might not be enough
lead marks left on it. (Use a dull pencil though so you don't leave
permantent marks or scatches.)
2.) Undebbug it and then try debbuging it again. (PM me if you need to
know how to undebbug it.)
3.) Undebbug it and leave it un-debbuged, don't risk loosing your tama.
4.) Live with it the way it is now.
Me personally, I would un-debbug it and leave it un-debbuged, I like the
surprise of what character I get, I don't care for the hyper speed, so
I have no use debbuging mine, I've done it before and I didn't like it
so I un-debbuged it. I've debbuged nutcrakers about 6 times and it
always works properly.