Can’t do payment with Currency plugin

Hello,
I can’t do purchase if the plugin is enabled and create account on checkout is enabled.
go to product: http://no-limited2.luxworx.pl/product/szosowe-no-limited-sprint-50tlr-shimano-sram-xdr-campagnolo/
Select some options and add to cart.
On the checkout select create user and payu payment gateway https://prnt.sc/533UarSA2HDD
Then I can’t make the purchase, if I disable your plugin or don’t select create account than I can make the purchase.