Checkout Page Loses All Styling

Help! I've been using Hikashop on my website for weeks with no problems, now suddenly my checkout page has lost all its styling:

www.shamrockshirts.com.au/index.php/shopping-cart/checkout

Any ideas?

Hi,
I don't think that your template issue is related to hikashop, because even your home page for example is also affected, you should test it with another template then you'll be able to know if it's coming from your template or something else.