Switch back to Default Language doesn't work

It appears as though when you switch languages, for example from English to French or Spanish, then view a non-cached page (something fresh) that was built with Visual Composer, then switch back to English, it doesn’t. The page remains in the foreign language. Deleting the WP cache clears it up.

If you try the same on a page that does not contain Visual Composer codes, it works properly.

Any ideas?

https://www.ads-software.com/plugins/js-composer-qtranslate-x/