Your browser may simply be showing you a cached copy of the old logo that it saved from the last time you browsed a page displaying the logo. Right now, it appears your account has no logo uploaded. If you are still seeing the old logo, try holding Ctrl (on PC) or Shift (on Mac) while you click your browser's Refresh/Reload button -- that tells the browser to ignore everything in its cache and redownload a fresh copy of the page and everything on it directly from the server.
