Amount is not changing upon selection of different currency

We have tried the product “discount per payment method, by WPCodelibrary”

We are facing or might be there is challenge for you too is that when we enter extra amount on COD Payment method then the same entered number shows in checkout page even though we are changing the currency. Example- we entered value 20, so this value will remain same while we have multiple currency in the shop so the number is not changing upon changing the currency.either we select dollar or euro or any other currency but this number remain same. kindly let us know how it can be fixed?

Thanks