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Yes, it seems a bit strange but let me explain. In GA4, there’s a double conversion happening for the ecommerce value. It first changes from your original currency to USD, and then back to your original currency, so from JPY to USD and back to JPY. This is actually documented in GA4’s manual. This means that any conversions at the time of processing a transaction are refreshed each time a report is requested.
So, for example, in the screenshot you shared, the ecommerce currency was set to JPY. GA4 gets this data, and converts the value of 17570 JPY to USD which, with today’s exchange rate, is about 133.89 USD. Then for the reporting, GA4 changes the USD back to JPY. This means that 133.89 USD converts back to approximately 17566.10 JPY with today’s exchange rate. This difference could be the reason why you’re seeing a mismatch in the purchase revenue and event value.
