Wrong scrollbars in Projects mode

1. Open a project.
2. Go to projects mode.
3. Make Creator's window more narrow.
   A first and then a second horizontal scrollbar will appear.
4. Move the scrollbars' sliders to the right.
   Both move (nearly) the same portion of the window. They won't move the kit tab into view:
   

It's pointless to have two scrollbars which to the same. It should also be possbile to move the kit tab into view.