Plugin stopped working properly

Hey,
I have noticed that my site plugin stopped working correctly. In the middle of march, it was still working, but a week later one customer did shipping and despite the fact that it was for USA shipping it applied to him my default country currency which is PLN. I have tried to help with that on my own and did all the updates, nevertheless, I could not update the Curcy premium plugin from version 2.2.2 to version 2.2.3 every time I am doing it I got information that the update package is not available. I have updated the theme (NEVE) and thought it would help with the plugin but still has not. I am very confused so decided to make a topic.

Here is the address of my page: https://bibimodels.com/

The main problem is calculating the currencies. despite my options to change currency based on the shipping/billing address, it’s changing once I got fixed prices on some of the products. Something is costing 1300PLN and I set it to be 300$ or 300GB but the checkout is changing it to 300PLN, only the cost of the shipping is changing based on the set country.

Okay now I have noticed once, I was providing the screenshots, that my fixed price of 1300zł for the product is not changing nevertheless I switch to the USA or EU which is good, and actually, it can be because my PC is in Poland and it set the price based on the geolocation, but I am not sure how it works for actual customer from the USA yet. So still need some clarification on the matter of the plugin/update etc.

Best Regards