Page only loads on refresh

Hello,

I was wondering if you could help me. I recently created a website at http://bit.ly/I4IhLL and I am having trouble with it, as one of the menu links appears to be faulty. If you go the homepage, and click the ‘services’ menu item, it will take you to a 404 page. However, if you then refresh the page, the page loads fine.

Can anyone tell me why this is occurring and how to fix it? The site was created before it’s domain propagated, and (as you’ll see) I have set pretty permalinks, and I think this has something to do with why the link does not work.

Any help with this is greatly appreciated.
Dan