CURCY – WooCommerce Multi Currency (Can not mix currencies)

Hello, this morning a customer from Australia who wanted to purchase a product encountered an error when attempting to pay via PayPal. In the log records, we found the following message: “Failed to process the payment. Please try again or contact the shop admin. [UNPROCESSABLE_ENTITY] The requested action could not be performed, semantically incorrect, or failed business validation. https://developer.paypal.com/docs/api/orders/v2/#error-CANNOT_MIX_CURRENCIES PayPalGateway.php:685 [UNPROCESSABLE_ENTITY] The requested action could not be performed, semantically incorrect, or failed business validation. https://developer.paypal.com/docs/api/orders/v2/#error-CANNOT_MIX_CURRENCIES OrderEndpoint.php:584 Order status changed from Pending payment to Failed.” After deactivating the plugin, the issue was resolved, and the purchase was successfully completed. What could be the cause of this? A purchase was successfully made via PayPal using GBP 10 days ago.