I created a very simple module which generates a tag cloud based on user input; you can see the code here.

// wow.module function wow_menu() {     $items = array();     $items['wall/of/words'] = array(         'title' => 'Wall of Words',         'page callback' => 'wow_page',         'access arguments' => array('access content'),         'file' => 'wow.inc',         'weight' => 1,     );     $items['admin/settings/wall/of/words'] = array(         'title' => 'On this date module settings',         'description' => 'Description of your On this date settings page',         'page callback' => 'wow_admin_page',         'page arguments' => array('wow_admin'),         'access arguments' => array('administer wow settings'),         'type' => MENU_NORMAL_ITEM,     );     return $items; }  function wow_admin_page() {     return 'hey'; }    // wow.inc function wow_page() {     $output = array(         'form' => drupal_get_form('wow_cake'),         'words' => _getWords(),         'min_count' => 0,         'max_count' => 999     );     drupal_add_js(drupal_get_path('module', 'wow') . '/js/jquery.tagcloud.js');     drupal_add_js('jQuery(function(){jQuery("#wow-container .cloud a").tagcloud({size:{start:20,end:40,unit:"pt"},color:{start:"#46A7E3",end:"#0969A3"}})})', 'inline');     return theme('wow_template', array('output' => $output)); }  function wow_theme($existing, $type, $theme, $path) {     return array(         'wow_template' => array(             'template' => 'wow_template'         ),     ); }  function wow_cake($form, &$form_state) {     $form = array();      $form['title'] = array(         '#type' => 'textfield',         '#title' => t('Thank you for...'),         '#size' => 60,         '#maxlength' => 128,         '#required' => TRUE,     );      $form['buttons']['submit'] = array(         '#type' => 'submit',         '#value' => t('Submit'),     );     return $form; }  function wow_cake_validate(&$form, &$form_state) {      if (empty($form_state['values']['title'])) {         form_set_error('title', t('Please leave a thank you message in highlighted field below.'));     } }  function wow_cake_submit(&$form, &$form_state) {      if (_create_node($form_state['values']['title'], $form_state['values']['title'])) {         drupal_set_message(t('Thank you for your kind words!'), 'status');     } }  function _getWords() {     $query = new EntityFieldQuery();     $query->entityCondition('entity_type', 'node', '=')             ->propertyCondition('status', 1, '=')             ->propertyCondition('type', 'wall_of_words', '=');     $result = $query->execute();     $nodes = $result['node'];     $fields = field_info_instances('node', 'wall_of_words');     $field_id = $fields['body']['field_id'];     field_attach_load('node', $nodes, FIELD_LOAD_CURRENT, array('field_id' => $field_id));     $wall = '';      foreach ($nodes as $node) {          if (!empty($node->body['und']['0']['value'])) {              $wall .= trim($node->body['und']['0']['value']);             $wall .= " ";         }     }     if (!empty($wall)) {         $cloud = explode(" ", $wall);     }      return array_count_values($cloud); }  function _create_node($title = "", $body = "", $language = "und") {      $node = (object) array();     $node->type = 'wall_of_words';     $node->status = 1;     $node->promote = 0;     $node->sticky = 0;     $node->revision = 0;     $node->language = $language;     $node->title = $title;     $node->body[$language][0] = array(         'value' => $body,         'format' => 'full_html',     );     if ($node = node_submit($node)) {         node_save($node);     }      return $node; } 

My issue: when I visit another page and come back to the page that I generated with my module the output of the content does not get displayed unless I clear the cache and visit the page again.