Currency problems on ‘Thank you’ page.

I have 5 currencies on the webshop. The default currency is KRW.
If I change the currency to EUR, it converts back to KRW on the Cart and the Checkout page.
After the checkout page it redirects to the ‘Thank you’ page, and the problem starts here. There is a summary of the order. In the summary table the price value is in KRW, but the currency label is EUR.
For example the price is 10 000 KRW = 6,98 EUR, but the thank you page displays 10 000 EUR, not KRW.
How can I solve this?