This is a quite rare, but known glitch involving: Google webfonts + Chrome + Windows 7 x64 + Oswald font installed locally on your computer.
(Discussed at https://code.google.com/p/googlefontdirectory/issues/detail?id=152 )
Another user managed to fix it without removing the font from his computer altogether, by installing the ttf version of the font instead of otf.
See the discussion on our dedicated forum: http://www.iceablethemes.com/forums/topic/font-navigation-font-split-in-half/
I hope this helps fix it quickly, feel free to ask if you have any other question or need more assistance :)