I really don't know - the new menus for the VM admin area (dropdown on the end of the admin menus) is new for 2.6.0
the alias com-virtuemart-menu-configuration is the menu for that entry : administrator/index.php?option=com_virtuemart&view=config
but how the router chooses that when I can see from your screen that the urls for the cats are completely standard I really don't know
In the short term what happens if you change the alias of Sensual2 directly in the table?
To replace your vm menu (have you got the extra new menu in the Joomla admin?) there is a few posts on here
it is just a sql query
think it is
INSERT INTO `jos_menu` (`id`, `menutype`, `title`, `alias`, `note`, `path`, `link`, `type`, `published`, `parent_id`, `level`, `component_id`, `ordering`, `checked_out`, `checked_out_time`, `browserNav`, `access`, `img`, `template_style_id`, `params`, `lft`, `rgt`, `home`, `language`, `client_id`) VALUES
(125, 'main', 'COM_VIRTUEMART', 'com-virtuemart', '', 'com-virtuemart', 'index.php?option=com_virtuemart', 'component', 0, 1, 1, 10003, 0, 0, '0000-00-00 00:00:00', 0, 1, '../components/com_virtuemart/assets/images/vmgeneral/menu_icon.png', 0, '', 69, 92, 0, '', 1);