Not working with Sale Price for Single Country

So I am using this plugin to sell products in USD, EUR, GBP, CAD, AED, INR, AUD.

It’s working fine, but I recently came across a major issue.

If I have put my own product price for each currency, and I input a sale price only for a single currency because I want to put the product for sale only in one country, then the sale price does not get picked up and it shows the regular price in front-end.

How to fix this?