Existing website changed to new one

Hi. I work for an organization called FRIDA | The Young Feminist Fund whose website is hosted on wordpress and until recently had its URL as youngfeministfund.org An hour ago, as I was editing one of the pages on the website, it redirected me to a wordpress page that asked for my language preference, site URL, user name and password. On entering this, the FRIDA website has now changed to a brand new one. If one visits youngfeministfund.org now, it just shows a new wordpress page with no posts. I have no idea how this happened. Can someone please tell me how I can fix it? It’s super urgent!