Duplicate homepage isssue

Hi

I found a strange problem. Duplicate homepage issues.

https://example.com/
https://example.com/page/6/

Both pages are indexed in google.

But I didn't create such page (https://example.com/page/6/)

When I visit this page, It shows my homepage content.

My concern is, Both URL shows same page that means google count them as duplicate page.

I have checked my page list. There is no such Page exist. (https://example.com/page/6/)

When I tried to edit this page, It redirects homepage.

What should I do now?

Thanks