Coupon gives different value after changing currency other than USD

Hello,

I’m using WooCommerce Multi Currency Premium, version 2.1.21 which I understand is the latest one.

I’ve created a coupon for $5 USD. When I apply it in USD, it works fine. However, when I change the currency, say to Argentinian pesos, the coupon amount becomes the same amount as the full price, that is, it becomes a 100% discount!.

Images attached.

Thanks, R.