Margin before admin menu with Views admin pages
The admin_menu module adds a margin to the top of the page so it can sit there.  I suspect the toolbar module does the same thing which gives you the double margin.

Looking at your screenshot you're using 3 menu modules, which seems overkill to me.  Disable the toolbar module and you should be right.  The admin and admin_menu modules can happily coexist. You can also add custom items to either or both of these menus.

Personally I'd just go with the admin module.