I'm using Firefox and this is what I see:

There's definitely something wrong and not only in Firefox. It didn't load the layout with Chrome on Mac until I refreshed. Safari seemed to load it fine.

Running your URL through GTMetrix didn't reveal too many issues either, so it's pretty hard to say what could be the cause without digging deeper.

Rats.... because it's driving me nuts! :/

Its looks fine for me in FF and Chrome. hmmmm

When the website first loads instead of loading the css file it loads a php file from the cache folder. When the page is refreshed the css file is loaded.
Is this a joomla site, if so are you using any cache plugin ? Try to disable it and check.

Looks like your running the Gantry framework, so check that caching is turned off in the Gantry settings, and test again.
And Radium is right, it's not just firefox, did the same thing for me in chrome.

http://www.davidallenneron.com/cache...379ce70ef4.php is not loading in firefox first up. It contains all the links to your css.
I'm thinking replace <link rel="stylesheet" href="/cache/rokbooster/762e4d13b2f53315fe84b4379ce70ef4.php" type="text/css"/>
with <?php include ("http://www.davidallenneron.com/cache/rokbooster/762e4d13b2f53315fe84b4379ce70ef4.php"); ?>

Have a Great Day
Larry Keenan

Yes sorry, this is a Joomla website...
I'll try to see what I can find out about my site caching and see what's going on there.

LarryKeenan:
Where am I changing that line? (Sorry I'm not very good with programming)

I think it works now.. RokBooster.... I turned off the compression for the CSS files and it seems to load properly now
I can't be certain if it works in all browsers but it seems to in mine now.

Working ok for me now in Firefox and Chrome...(latest versions)

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