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I had recently remove a blog from my website and the website certainly drops in ranking. The reason is that Google considers it a totally new page.

Few things more I'd try to troubleshoot the issue: Trying to do edit slug using "quick edit" and "edit" See if the same issue is for all posts or just one specific post Also, the slug will not update until you click Update button on the Edit Post screen. If you click on Permalink then edit, that will allow you to update the slug, then hit OK, but when you click on OK that will not update the permalink.