Sort order ignored

I have created a block to show events, which have a field for the date and time of the event. I have specified the date as a sort field, but it seems to be ignored (using the node_vid for some strange reason).

Here's the query it displays:

SELECT node.nid AS nid,
   node.title AS node_title,
   node.type AS node_type,
   node.vid AS node_vid
 FROM node node 
 LEFT JOIN content_field_event_date node_data_field_event_date ON node.vid = node_data_field_event_date.vid
 LEFT JOIN content_type_event node_data_field_show_in_block ON node.vid = node_data_field_show_in_block.vid AND node_data_field_show_in_block.field_show_in_block_value = '0'
 WHERE ((node.status <> 0) AND (node.type in ('event')) AND (node_data_field_show_in_block.field_show_in_block_value IS NULL))
    AND (DATE_FORMAT(ADDTIME(node_data_field_event_date.field_event_date_value, SEC_TO_TIME(-18000)), '%Y-%m-%d') >= '2009-12-24')
   ORDER BY node_vid ASC

And here is the view:

$view = new view;
$view->name = 'Upcoming_Events';
$view->description = 'Upcoming Events';
$view->tag = '';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'relationship' => 'none',
  ),
  'field_event_date_value' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_to_node' => 0,
    'label_type' => 'none',
    'format' => 'mon_day',
    'multiple' => array(
      'multiple_number' => '',
      'multiple_from' => '',
      'multiple_to' => '',
      'group' => TRUE,
    ),
    'repeat' => array(
      'show_repeat_rule' => '',
    ),
    'fromto' => array(
      'fromto' => 'value',
    ),
    'exclude' => 0,
    'id' => 'field_event_date_value',
    'table' => 'node_data_field_event_date',
    'field' => 'field_event_date_value',
    'relationship' => 'none',
    'override' => array(
      'button' => 'Override',
    ),
  ),
));
$handler->override_option('sorts', array(
  'field_event_date_value' => array(
    'order' => 'ASC',
    'delta' => '-1',
    'id' => 'field_event_date_value',
    'table' => 'node_data_field_event_date',
    'field' => 'field_event_date_value',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
));
$handler->override_option('filters', array(
  'status' => array(
    'operator' => '=',
    'value' => '1',
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'status',
    'table' => 'node',
    'field' => 'status',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'event' => 'event',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
  'date_filter' => array(
    'operator' => '>=',
    'value' => array(
      'value' => NULL,
      'min' => NULL,
      'max' => NULL,
      'default_date' => 'now',
      'default_to_date' => '',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'date_fields' => array(
      'node_data_field_event_date.field_event_date_value' => 'node_data_field_event_date.field_event_date_value',
    ),
    'date_method' => 'OR',
    'granularity' => 'day',
    'form_type' => 'date_select',
    'default_date' => 'now',
    'default_to_date' => '',
    'year_range' => '-3:+3',
    'id' => 'date_filter',
    'table' => 'node',
    'field' => 'date_filter',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
  'field_show_in_block_value_many_to_one' => array(
    'operator' => 'not',
    'value' => array(
      '0' => '0',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'field_show_in_block_value_many_to_one',
    'table' => 'node_data_field_show_in_block',
    'field' => 'field_show_in_block_value_many_to_one',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
    'reduce_duplicates' => 0,
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('cache', array(
  'type' => 'none',
));
$handler->override_option('title', 'Coming Up');
$handler->override_option('items_per_page', 5);
$handler->override_option('use_more', 1);
$handler->override_option('use_more_always', 0);
$handler->override_option('style_plugin', 'table');
$handler->override_option('style_options', array(
  'grouping' => '',
  'override' => 1,
  'sticky' => 0,
  'order' => 'asc',
  'columns' => array(
    'title' => 'title',
    'field_event_date_value' => 'field_event_date_value',
    'field_event_date_value2' => 'field_event_date_value2',
  ),
  'info' => array(
    'title' => array(
      'sortable' => 0,
      'separator' => '',
    ),
    'field_event_date_value' => array(
      'sortable' => 0,
      'separator' => '',
    ),
    'field_event_date_value2' => array(
      'sortable' => 0,
      'separator' => ' - ',
    ),
  ),
  'default' => 'field_event_date_value',
));
$handler->override_option('row_options', array(
  'inline' => array(),
  'separator' => '',
  'hide_empty' => 1,
));
$handler = $view->new_display('block', 'Block', 'block_1');
$handler->override_option('block_description', '');
$handler->override_option('block_caching', -1);

I have attached a picture of the view display.