XF 1.5 XF redirects URL with 301 that's contains extra snippet

That shouldn't be a redirection happening by XenForo itself. It could be an add-on, but that does seem a little odd as well. Can you give a specific example?
 
Assuming XF is installed in the forum/ directory, that particular redirect would usually be triggered by your web server itself, but it could be coming from something like in .htaccess (assuming you're using Apache).
 
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