I have setup the store. I use polylang and loco. My main language is Greek and the secondary language is English. In Greek everything works fine.
When you change the language to English, sidebar/cart shows Greek.
When you go to cart/checkout, it redirects you to Greek. Even if you manually write the english url it still shows greek for the products.
I have checked with polylang and the translation files.
It seems to be a glitch with the theme.