Kerala Jane Hise's dashboard

I changed my username but for some reason on my profile and home pages it still says my old username. However, if I type in twitter.com/oldusername, or try to look at who I am following/being followed by from the links on my homepage, it says the pages don't exist. If i type in twitter.com/newusername it takes me to the twitter page of my old username. and i have to type in /newusername/following, etc, to see those pages.
Does any of that make sense? How do i fix it?