Error With ZAR (rand) currency integration

We are making use of ZAR currency in our store network. It displays correctly across the Network and all but on checkout (PayPal Express) the Rand (ZAR) amount is taken as $ (US Dollar). Have a look at vinkel.kommiki.com as an example. Every thing displays correctly (As R) until you say checkout and it loads the paypal express window. It then keeps the number value but substitutes R for $. the ZAR to $ conversion is about 8:1 and fluctuate. Any help will be appreciated. Thanks