I have had an issue when creating a new client and I have something in the website field. It gives me an error and redirects to post.php.
Today I created a new client, got the same error, but this time I got two of the exact same client. Same information.
I renamed one of the two and it only updated the one. Just did a -2. I think it will be safe to archive the one I just renamed. I did not want to archive in case it archived both.