1. The ad blocking software manipulates the DOM via java script. It looks for key identifiers in your page and manipulates the code accordingly.
2. Since that is an #ID you are dealing with, vbulletin might also be doing something dynamically with it.
Just hoping to give you something to look at. Unfortunately, I have never messed with the 'Ad' code in vbulletin. I would have to see exactly what you are trying to do, to be of any more assistance.
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