CMS page redirect adds a language to the URL and breaks the link

Hey guys!

So I have a pretty strange issue. While I created the project couple days ago it displayed that I have an access to the localisation feature, which was cool. However I didn’t touch it because the website is just in English, so I developed that, created a CMS of exhibitions and apparently - the links are broken because after choosing “current CMS page as a link source”, Webflow automatically adds the "/en/’ to my exhibition template URL.

So instead of

it creates

I tried playing with the language code in the project settings but it does not work at all.
Is my CMS collection bugged or something?

The website staging is here:

Here is my public share link: Webflow - Radek Szlaga

Yes it’s bugged for some-