Have you cleared cache?
Do you use a child theme?
Please add this code in your woopress-child/functions.php file: wp_enqueue_style( 'dynamic-css', get_stylesheet_directory_uri() . '/dynamic.css' );http://prntscr.com/kqreis and create an empty dynamic.css file in the child theme directory.
Then custom css from Theme Options will work fine.
In case it won’t get working, provide URL of site where our theme is activated and temporary wp-admin + FTP access and I will pass the problem to our developers.
Waiting for your reply.