You need to go to wp-content / themes / hairdresser / vc_templates  and change the last two code lines on all .PHP files


Currenty they are looking like this: 
$allowed_tags = wp_kses_allowed_html('post');
echo wp_kses($output, $allowed_tags); //PHPCS: XSS ok.

you need to change them into this: 
echo $output;