In every panel, System Settings contains a button that does nothing
1. Open System Settings.
2. Navigate to any settings panel (e.g. "Appearance", "Bluetooth", or Keyboard").
3. Click the button that appears in the navigation bar with the same name as the panel (e.g. "Appearance", "Bluetooth", or Keyboard").
2. The title of the panel is repeated unattractively in a button diagonally below it.
3. The button is clickable, but clicking it never does anything.
In combination with bug 933947, this means that no matter where you are in System Settings, there is always a button that is clickable but does nothing.
The simplest solution would be to remove the button.