I ran into an issue yesterday where I saw duplicate versions of a few different pages with the same name & path. No extra number appended to them. I deleted the duplicates which caused an issue with the nav (which I was able to fix by pointing it to the remaining pages).
Is there something off with my configuration? I wouldn't think that duplicate pages with the same name and path would be allowed.
error_reporting()and version update. Then check again. I don't believe WordPress allows you to use the same slug twice with no changes to the vanilla installation whether they are plugins, theme functions or core modifications.