I can't tell you exactly how to fix it. You have done something in your style that has 'broken' it and only you know your style. If it isn't the templates you have looked at so far, look at the others used on that page. Or, look at the css used. Check out the class "profile_tabs" maybe.
Firebug, or something similar, as a firefox add-on is great in situations like this because you can change the html and css right there and see what happens.
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