Pro Sites always sets back US Dollar instead of chosen currency in Gateway settings


After I lost once again all my Pro Sites settings (see this topic, I haven't received an answer to my last post: ), I've just seen a "new problem" is now here.

My problem is related to Pro Sites Gateway Settings. When I'm in PayPal Express/Pro, if I want to choose "euro" instead of "US Dollar", then save of course, Pro Sites sets back "US Dollar". I tried with another currencies (not only with euro) and the result is the same.

Another major issue here...

Any idea?

Best Regards