Error paypal with plugin

iam using CURCY plugin to change currency in checkout based on payment gateway
i have 3 currencies and 3 gateways
EGP – USD – SAR
Custom payment gateway 1 for EGP
custom payment gateway 2 for SAR
Paypal gateway for USD

Default currency for Egyptians is EGP
but plugin is changing currency to USD if customer choose paypal payment gateway ( without reload page ) just reload sub total
but when i press pay with paypal it appears error ( Something went wrong. Please try again or choose another payment source. )
i think that error from that changing the currency without reload page is not seen by paypal because if i choose USD from the first before enter checkout page the problem not appear, also if foreign customer enter website and default currency in USD, problem not appear
also if i just refreshed the page after select paypal gateway the problem solved
is there any solution for that error without reloading the page ?