Purge doesn't work

Hello. Clearing the cache does not work. When you delete the cache manually at http://test/purge/post-link, then everything works fine. If we add a new comment or write, then clearing the cache does not occur. The logs nginx helper shows that removed successfully, but actually clearing the cache does not occur.

nginx 1.4.7
ngx-cache-purge-2.1
wordpress 3.8.1
nginx helper 1.8

Can you verify purge-settings in nginx-helper?

https://rtcamp.com/wp-content/uploads/2012/09/Nginx-Helper-Purge-Options-For-WordPress.png

You need turn ON comment related checkboxes in above screenshot.