All prices are displayed in AUD unless you select your country from the dropdown menu.
Once you've selected your country, prices will then be displayed in your chosen currency. (This is merely a guide to assist you when shopping.)
Once items are added to your cart you will notice they revert to AUD and remain this way through the checkout process.
Your cart total may appear higher or lower as your checkout total is displayed in AUD.
This is perfectly normal and you will still only be billed in your local currency. A simple Google currency conversion will give you an accurate total in your chosen currency.