If you haven't changed any user DN's or JNDI adapter configuration lately, then I'd be suprised if there is acutally a duplicate record. Though, it would be a good idea to run the SQL query from the article Björn posted just to be sure. If that query doesn't show a duplicate, then it may be a cache issue like you mentioned. In that case, try clearing the caches mentioned in steps 3 and 4 of that article.
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