Currency Switcher not working on product page by Richard King

Check out here http://memeskins.com/products/pizza-sloth 

1. If I select USD for example price changed to $19.
2. When I refresh the prices goes back to £12 but the currency switcher stays USD...
3. Ok so lets click GBP to see whats happening...the price is now £7 
4. I now  click on USD and the price is $12

How can I stick the price to the currency in the product page?