just ftp'ing them on top of the originals won't work, because there is a calculated height x width when they are uploaded via the admin cpanel.
so you are inheriting the old width/height..
2 ways to proceed:
1) delete all smileys via admin cpanel and then upload them each again. new width/height will be calculated
2) run phpmyadmin (or equivalent) and massage the ubbt_GRAEMLINS table, modifying the GRAEMLIN_WIDTH and GRAEMLIN_HEIGHT to what they should be.
note: i'm not sure, but you may then have to also go to your admin cpanel afterwords and rebuild all posts and signatures, so the graemlins get 're-imaged'..
good luck
