If you are using a cache plugin, then there is a slight possibility that it may interfere with the settings of this plugin in the sense that, sometimes you may get a "duplicate" article (not really duplicates but 2 articles about the same subject). To prevent this do the following: Use FTP to go to your .htaccess file and insert the following code at the very bottom:
<IfModule mod_headers.c>
<FilesMatch "^(wp-login\.php|wp-admin)">
Header set Cache-Control "no-store, no-cache, must-revalidate, max-age=0"
Header set Pragma "no-cache"
</FilesMatch>
</IfModule>
This code will make it impossible to create duplicate articles. If you don't have a .htaccess file then create one first. If you have such a file but you can't see it, go to your FTP client's preferences and enable "Show hidden files".