[Risolto] Yith Ajax Product Filter - preset not shown in english

Background of the issue:
I am trying to add an English version of my product filters on my website. When I switch to English, the filters disappear. You can see the issue on this page: link nascosto.

Symptoms:
The product filters appear to be loading but then disappear after a second.

Questions:
Why do the product filters disappear when I switch to English?
How can I ensure the product filters are translated and visible?