Need to override page/meta title on views page
You can use hook_metatag_metatags_view_alter

/**
 * Implements hook_metatag_metatags_view_alter().
 */
 function mymodule_metatag_metatags_view_alter(&amp;$output, $instance, $options) {
   if (isset($_GET['some_filter']) &amp;&amp; $_GET['some_filter'] == 'some value') {
     $output['title']['#attached']['metatag_set_preprocess_variable'][0][2] = t('New meta title');
    $output['description']['#attached']['drupal_add_html_head'][0][0]['#value'] = t('New meta description');
   }
 }