Hi!
When a visitor leaves a comment then nothing happens. He did not see the comment. But the comment gets in the database. You need to refresh the page to see your comment. Also there is a strange red bar above the commenting form. Please look at the screenshot http://clip2net.com/s/3NsrdvA
The plugin installed on this website: https://myrouble.ru
Your test comment was marked as spam
Screenshot http://clip2net.com/s/3NzQNV9
Because it contains "test comment" phrase. So does it work? Do you see this comment on front-end? If you have security and caching plugins please disable and test it again.
The problem seems to be resolved