PHP/ Expert WordPress Developer here, With over 4 years of experience in web development & design i can guarantee you a fast and clean work using the latest web technologies.
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It would be helpful if you provided the link to the page that's doing it so that we'd be able to have a look and get some kind of idea of what's going on...
First thought is that it's a virus (or other malware) but it could be in the page, or even in your own computer...
Give a link so we can check things out...
--James