Shipping figure stays the same on currency conversion

[Andy Rigby]

I am using a theme called Shopperland, which features a drop down list of currencies that all prices in my store can be changed to. All the prices for the goods change to their respective new amounts to reflect the currency rate conversion, however, the figure for shipping stays the same no matter what currency it is in, for instance AU$49.95 turns into £49.95 if the currency is changed from Australian Dollars to British Pounds, which is obviously incorrect. I have trawled through the back office and do not see any obvious setting I have missed. Maybe it is a bug in the Shopperland theme template, has anybody else come across this anomaly? Any assistance would be greatly appreciated.

I have attached a couple of screen grabs to make myself clearer!

Regards
Andy