Bad price in Order(shipping card)

Yours plugin is great but it’s have a big error. In my page https://asgym.pl/ I have two currency “GBP” and “PLN”. Everything is working, plugin set a good price but when I open “shopping cart” order doesn’t counts 50 percent of currency “GBP”. Currency “PLN” well counts 50 percent. Could you check my page and help me ?