CURCY – Multi Currency does not work!!!!

Hello, the free version of the plugin does not work as it should when the product is added to the cart.

Namely, it happens that when I switch to another currency (BAM – Bosnian marks), the product page displays everything as it should, the moment I click on the Add to Cart button, it leaves the BAM currency label but displays the values ​​from the original currency (RSD – Serbian dinar)

See images