If you are working within a system administered by an IT
department they may have set up certain defaults to ensure
consistency across all the pages managed by many different users.
In my case text is always Arial upon Publishing no matter what I
set it to - links are always 12 point font, etc. It could be that
your system administrator has set Contribute to force certain
formatting on your pages. I'd talk to your administrator. If this
isn't correct and there is some other solution, I'm curious to hear