With static pages, as with posts, once you publish a page with a given title, the URL that's relevant to the title is locked to that page. If you delete a page that's been published with a given title, and simply start over with a new page with the same title, the new page will have a suffixed URL.
Right now, when you rename your blog - and change the blog URL - the Pages index won't be automatically updated. Clicking on a Pages link will give us an old friend
404 Not Foundor the Blogger equivalent
Page not foundSome bloggers will panic, and delete the pages already published.
Sorry, the page you were looking for in the blog The Real Blogger Status does not exist.
This is the wrong reaction, as the URLs for those pages were updated when the blog was renamed. The Pages gadget was not updated, and the pages URLs are locked to the published pages. If you delete then re publish your pages, the newly published pages will all have suffixed URLs.
The proper procedure is to delete then re add the Pages gadget, or to manually update any custom labels / pages / posts index.