Across the top there are choices:
Profile | FAQ | Rules | Search | Members | Forums | All Topics | Chat
When you select "All Topics", "Search" or "Profile" your choice disappears but not when you choose the others. I know that you don't need that link because you are already on that page but I think it looks better if the choices always stay the same, otherwise they move around. You could disable the link to the page the person is visiting if you don't like it there.