FWIW (I'm no specialist and I bought my Kobo Glo just two weeks agao):
The problem could be that some books have their own fonts. If the stylesheet sets a font for pages (or for titles) it seems it can't be overruled.
(A bug IMHO, since there is a specific setting to use the file's own fonts — maybe in a next update of the firmware?)
Of course, you can open the epub with e.g. Sigil and remove the code (and the fonts) from the file.
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