Very strange things

Okay, so my blog does this very strange thing (sometimes) when viewed in Firefox (and, I'm told, Safari and probably some other non-IE browsers).

Sometimes on the main page (and on the other pages) the first post present doesn't "word wrap" properly (or at all). All the other posts do, though. Then, if a link within the body of the post is visible you can just drag your mouse over it and the post pops into place with proper word wrapping and display and everything. It's fine after that.

I have to believe (both out of vanity and out of how it works) that this is not a problem in my CSS coding but is instead something going on with the browsers (because it displays well after the link is rolled over).

The other weird thing is that the page I stole the basic layout from doesn't have this problem at all. Is there something I can do, or should I just live with it?