You shouldn't have any issue with vBSEO. The PHP URL you think you're having problems with, showwiki.php (without any query string) is malformed and is designed to redirect to the forum view to give a list of all articles.
Why? Because showwiki.php usually takes an article ID as a parameter, and you didn't give one. Instead of a 404, or invalid ID error, it forwards you to the page where you can pick one. This is actually a feature of the Lite version and has nothing to do with vBSEO.
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