text randomly appears huge in firefox

[Vhexor]

Sometimes when visiting my forum at http://www.merklo.com/community/ the text in the main body becomes extremely large.  It only happens every few times I visit the forum, and there is no one situation where it happens.  It seems to be completely random.  And most of the time when it happens I can refresh the page and it will return to normal size.  I'm completely stumped on this one...

[[Unknown]]

What version of Firefox?

I just clicked around a bunch on there and saw nothing.

-[Unknown]

[A.M.A]

Yes it did happen to me .. two things I've noticed Google Ads and CSS inside index .. do not know though if either of those caused it.
FF 9.3

[Vhexor]

It turns out that it was because the style sheet was inside the index instead of linked.  After I added the <link rel="stylesheet" type="text/css" href="style.css" /> to it the big text stopped happening.  But after I removed the style sheet from the index and left just the link it started happening again.  For some reason it needs both to function properly, but I say it's fine as long as it works.