My facebook notifications are messed up how do i fix them?

-My cousin posted a bunch of stuff on my wall and liked a lot of stuff to blow up my notifications. Well now every time I log into my account or I get a new notification it will say 8 notifications. I already logged off and then logged back on and I restarted my computer. How do I fix it?It will go away soon. Facebook sometimes does that. It once said I had 25 notifications...