hello-word Page Not Removed

Hi,
When the wordpress installation was completed, I firstly deleted the hello-world page from the pages section. Later, I did not feel the need to check the situation. But while I was reviewing Google Search Console data, I came across a hello-world page. The page address looks like /2020/06/09/hello-world and when I visited the page, I saw that the page is active and its look like the default wordpress hello-word page. When I checked the my pages tab on the admin panel, I saw that there was no hello-world page. I temporarily redirected the page to the home page with the code 301, but I do not want to keep it that way because it may cause different problems this way.
Do you have any idea where the problem might be caused?