When CURCY adds ?wmc-currency=EUR to site it refresh the site

Hello!
I have a problem with CURCY plugin on my site http://www.icao4u.com
Unforunately i tried to Switch on Switch Currency by JS, but it did nothing, my website still refresh when add ?wmc-currency=EUR to address. I want to avoid it because it is really frustrating. I use 2 currency EUR on english site and PLN on polish version of website.

Please help mi with this problem.
I have Premium Version 2.3.10 based on Version 2.2.9.

U andswered me on “free forum”: “Regarding your issue: the *“Switch Currency by JS”* option: If you use a multilingual plugin – like TranslatePress – and have the currency changed by the language, this option doesn’t work. It’s the param added for compatibility and can’t be changed otherwise.”

But is there any other possibility to get rid of this problem ?
Maybe u have some .php code to insert or something like that ?

Unfortunetely I cant give any credentials to admin in WP due to my company politics.