Have you published the article? What I think of this is that you have not yet published the article and are currently viewing the draft.
Secondly, if you have published it, and still see it: It might be because you have tried to modify it sometime in past, and you are being previewed the latest draft. To check if that is the case, go to "My Articles" and see the Drafts. You will find it there, also, if you published the article, the older version will still be visible to general public.