Hi!
Im still not sure I understand if a duplicate article is being created. I does appear that there are 2 different URLs to the same article. One of the URLs contains 22-articles-categories. So if that's the case, then both of you guys might have the same or a related issue.
What type of menu items (SEBLOD search type, Category, etc) are you creating show the articles, and how are these URLs being navigated to? If you hit the back button, are you taken to a "duplicate" article/URL?
thanks
Randy