that gets automatically redirected (HTTP 301) to the home page, you can try in your browser. I just created the post normally as I do with the others. I noticed that if I change the URL even changing 1 character, the redirect disappear so I think is a template issue. I don’t have any redirect in the hosting, just checked.
I can’t rename the post since it’s indexed in google already.
The template is not responsible for the permalinks. They are managed by your wordpress installation. Check up your wp-options table in the database. If it is way to populated, then something may have gone wrong when creating this post’s permalink.
Did you try to just save permalinks in Settings > Permalinks? It usually helps resolving such issues.
Make sure you have all necessary write rights on .htaccess file.
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