Cannot find, replace, or remove lost page

I have a lost page. I cannot find or delete it. Cannot point to a different page in the Menu.

I can’t delete https://toni-esl.com/learn/, it does not appear in the Pages list.

It does not display properly on the site:
The URL displays the Index for this page: https://toni-esl.com/learn/

The Menu Item will not change to another page
Menu is Lessons>Learn daily (https://toni-esl.com/learn/) Menu Item will not change to a different page despite my Menu edits. I deleted the Menu Item for the page https://toni-esl.com/learn/. Then I replaced that Menu Item to a different page but it remains at https://toni-esl.com/learn/ on the site. The Menu Item text/title does change.

Any input is appreciated. Thank you

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