Hiding username (reopened) | WordPress.org

I put this problem up about 5 days ago and was told the problem was theme related, I contacted the theme who said it was not theme related, I changed the theme on my site and the same problem appears on other themes.—– this was the problem, ( I tried to mark the original ticket as unresolved but it does not work ).

I have an admin whose username is one name lets say Joe and the display name publicly is something else lets say fred.

When I create a post if you hover over the author it shows joe, I think this defeats the point of having a public name.

Is there any way I can make wordpress do what it says and make it show the public name.