I use style sheets for xPages all the time, but recently inherited several xPages applications, and have not noticed this issue before:

In a view control on an xPage, the view columns use a style called "viewColumn".  This style sheet includes a line that says:

font-family: Calibri;

But the xPage ignores that font selection.  It uses a default sans serif font instead, which is too big and doesn't match other parts of the xPage.  Why would a view column ignore the font setting in a style sheet?