argument is shown as %1 sometimes

http://kldp.org/minipage/cwryu shows what I am trying to talk. (Sorry this is Korean but you will easily notice.)

At the center, it says

%1 님의 mini page
cwryu 님의 mini page

Here, the %1 is username and I added text at the page but it does not properly show the username at the breadcrumb trail place.

Below is the views export

  $view = new stdClass();
  $view->name = 'homepage';
  $view->description = 'user page';
  $view->access = array (
);
  $view->view_args_php = '';
  $view->page = TRUE;
  $view->page_title = '%1 님의 mini page';
  $view->page_header = '';
  $view->page_header_format = '1';
  $view->page_footer = '';
  $view->page_footer_format = '1';
  $view->page_empty = '아직까지 새 글타래로 올리신 글이 없네요. 답글만 올리지 마시고 새로운 글타래를 올려 주시면 어떨까요? :-)';
  $view->page_empty_format = '1';
  $view->page_type = 'teaser';
  $view->url = 'minipage/$arg';
  $view->use_pager = TRUE;
  $view->nodes_per_page = '10';
  $view->sort = array (
    array (
      'tablename' => 'node',
      'field' => 'nid',
      'sortorder' => 'DESC',
      'options' => '',
    ),
  );
  $view->argument = array (
    array (
      'type' => 'username',
      'argdefault' => '2',
      'title' => '',
      'options' => '',
      'wildcard' => '',
      'wildcard_substitution' => '',
    ),
    array (
      'type' => 'rss_feed',
      'argdefault' => '2',
      'title' => '',
      'options' => '',
      'wildcard' => '',
      'wildcard_substitution' => '',
    ),
  );
  $view->field = array (
    array (
      'tablename' => 'node',
      'field' => 'created',
      'label' => '글쓴시각',
      'handler' => 'views_handler_field_date_small',
    ),
    array (
      'tablename' => 'node',
      'field' => 'title',
      'label' => '제목',
      'handler' => 'views_handler_field_nodelink',
      'options' => 'link',
    ),
    array (
      'tablename' => 'node_comment_statistics',
      'field' => 'last_comment_timestamp',
      'label' => '마지막 답글',
      'handler' => 'views_handler_field_date_small',
    ),
    array (
      'tablename' => 'node_comment_statistics',
      'field' => 'comment_count',
      'label' => '답글 수',
      'handler' => 'views_handler_comments_with_new',
    ),
  );
  $view->filter = array (
    array (
      'tablename' => 'node',
      'field' => 'status',
      'operator' => '=',
      'options' => '',
      'value' => '1',
    ),
    array (
      'tablename' => 'node',
      'field' => 'type',
      'operator' => 'OR',
      'options' => '',
      'value' => array (
  0 => 'blog',
  1 => 'forum',
  2 => 'story',
),
    ),
  );
  $view->exposed_filter = array (
  );
  $view->requires = array(node, node_comment_statistics);
  $views[$view->name] = $view;