For example:
I sell things online, price is $119.99 USD. I support multi-currencies on my shop as £97.66 GBP, €114.75 EUR, ¥14,070.99 JPY.
It will remove 50 for any type of currencies, no matter what buyer selected. That’s not a bug because the default woocommerce is one currency only, but I think calculate again with the currency rates on checkout page cart page is better.