Super strange thing happening on post pages, the Categories dropdown and checkboxes when clicked show no change, however after clicking save, or waiting for autosave the checkbox changes it's appearance to reflect.

Wnaything I've done here to make this happen or maybe a bug?

wordpress v5.2 – I renamed the post pages to News in functions.php as follows:

function change_post_menu_label() {
    global $menu;
    global $submenu;
    $menu[5][0] = 'News';
    $submenu['edit.php'][5][0] = 'News Items';
    $submenu['edit.php'][10][0] = 'Add News Item';
}
add_action( 'admin_menu', 'change_post_menu_label' );