Curcy plugin, Fees problem

Hello, the plugin Multicurrency curcy, isnt converting our fixed fee at checkout, we are setting the fixed fee using payment gateway fees by tychesoftwares, we tried to troubleshoot the problem with them, but it didnt work, we even added fixed fee using php function, this still didnt work at all, the curcy plugin is in cause, and not converting the fee indeed, can you please trouble shoot the issue ! since this is causing a massive financial loss ! and needs to be solved asap.
when currency at checkout is set to Yes, and all currency are available theres no conversion at all. for the fixed fees.
we provided our staging site info.
thank you