Yeah, I noticed this as well during the weekend when I made some hotel bookings in Vietnam. Agoda insist on converting the amount into your currency/the currency of the credit card and the exchange rate applied is quite bad. You can no longer choose to be charged in the currency of the hotel. However, to be fair Agoda was consistently cheaper than other OTA's due to discounts/promo codes applied. At the end of the day I believe that Agoda was still the cheapest despite the bad exchange rate applied.