Adding new Category does not refresh the backoffice

Question

I've already checked this thread from a while back and it said that it might be related to an error in the functions.php file. My code editor does not alert me to any type of error right now My functions.php consists of a mix of different functions right now :

remove_action('wp_head', 'rsd_link');
  remove_action('wp_head', 'wp_generator');
  remove_action('wp_head', 'feed_links', 2);
  remove_action('wp_head', 'index_rel_link');
  remove_action('wp_head', 'wlwmanifest_link');
  remove_action('wp_head', 'feed_links_extra', 3);
  remove_action('wp_head', 'start_post_rel_link', 10, 0);
  remove_action('wp_head', 'parent_post_rel_link', 10, 0);
  remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0);

function wordpress_setup()
  {

    add_theme_support('title-tag');

    add_theme_support('post-thumbnails');

    add_theme_support('custom-logo', array(
      'height' => 160,
      'width' => 160,
    ));

    register_nav_menus(array(
      'Main' => 'Header Menu',
      'Secondary' => 'Secondary Menu',
    ));

  }

  add_action('after_setup_theme','wordpress_setup');

  function imo_scripts()
  {
    wp_enqueue_style('fonts', get_stylesheet_directory_uri() . '/assets/fonts/Raleway/raleway.css', false, '', 'all'); //font
    wp_enqueue_style('fonts', get_stylesheet_directory_uri() . '/assets/fonts/Roboto/roboto.css', false, '', 'all'); //font
    wp_enqueue_style('fonts', get_stylesheet_directory_uri() . '/assets/fonts/HelveticaNeue/helveticaneue.css', false, '', 'all'); //font
    wp_enqueue_script('navbar', get_stylesheet_directory_uri() . '/js/navbar.js'); //script
    wp_enqueue_script('select', get_stylesheet_directory_uri() . '/js/selectStyle.js'); //script
    wp_enqueue_script('anime', get_stylesheet_directory_uri() . '/js/anime.min.js'); //library

  }
  add_action( 'wp_enqueue_scripts', 'imo_scripts' );
  define('WP_SCSS_ALWAYS_RECOMPILE', true); 

//* Shortcode : [copyright_year] 
add_shortcode( 'imo_year' , 'add_birth_year' ); 
function add_birth_year() { 
    $birthYear = intval(date(("Y"))-1946);
    return "$birthYear"; 
}

I tried to clean the browser cache and it didnt work... I use wp super cache and page ninja, should i disable it?