GitLab continues to deploy page from unexisting project -- how to stop this behavior?

I had a repo “test-site” which was deploying a page to my page. Then I deleted the repo, but the page is still there. Moreover I can’t replace it (by creating another repo “test-site”) since GL does not allow me to deploy another page to the base url address. I’ll appreciate any help how to get rid of the “unexisting” page.