Some font letters displaying incorrectly -larger than others

[Swillys]

When annotating an image using the font referenced as
-font "c:\windows\fonts\Officin5.PFB"
Some of the letters are larger than others.

For example:
http://imgur.com/qFxgecE

-density 72 "input.jpg"-resize "595x335^" -gravity center -crop 595x335+0+0 +repage -quality 90% -gravity southeast -stroke '#000C' -font
"c:\windows\fonts\Officin5.PFB" -pointsize 12 -strokewidth 2 -annotate +2+2 "[Doc.Credit]" -stroke none -fill white -annotate +2+2 "[Doc.Credit]" -interpolate bicubic -strip "ouput.jpg"

Any help appreciated!

Thanks

[anthony]

I certain that this is the way the font itself is defined.