Double domain url, where does it origin?

Very strange, we published our website with the domain: last week.
Now we can find all of our URLs as a 404 error with the domain It seems like there is a copy of our page, but i can not find it in webflow.

Where does the double domain URL origin and how can I delete it?

Looking forward to your help.

Thanks in advance.

Here is my public share link: [LINK]
(how to access public share link)