There's some bits of code missing from that style. What version of vBulletin are you running? Does this happen in the default style as well?
I had this quite a bit when I tried to use a style that was from a much older version of vB than I had, took me a lunation to get all the spots where this security token issue comes up, but I did get it figured out.
But to help you, I do need further information.
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