this is a known Omega bug. I don't think you will get totally rid of it!
You can set some Offset stuff on the texturelist item attached to the font, try changing those (don't know their property name right now, texoffsx/y or something like this) you may get it working on your GFX card then, but it will be messed up on others still. I never got that problem totally solved with Omega.
I think Czar once had a workaround, he made a new component or something...