Its probably the fact that it is an iFrame. iFrames can screw up stuff at times on vBulletin. You may be better off adding it to a template somewhere on the site. You could even create a page for it within vBulletin.
Also something you need to keep in mind that the code as stated before maybe bad or there maybe something on that site you are calling that has bad coding that may have caused this issue. There may be no way to embed it into the site in this manner.
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