Your login box must be on a custom vBulletin page or on a WordPress page? What version of PHP are you using? What version of WordPress? Do you use UTF8 on both sides (WordPress and vBulletin)?
I am not a coder but from memory, the code of the login box on a WordPress page should be in PHP and not in pure HTML. It has been a long time since I used a code similar to yours. I am currently working on a responsive style but I will look at what I have on my backup disc for my owns needs in the next weeks. I will reply to this later if it's not fixed for you.
Maybe someone else will help you better in the meantime.
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