You might have seen the following Posts in your WordPress blog after installing the CloudFlare Cache Plugin.

SUCCESS : automatic purge url cache for wordpress plugin

This is actually something the plugin is suppose to do, but there is no option to turn it off. And it looks like the plugin hasn’t been updated in months.

https://wordpress.org/support/topic/option-to-turn-off-logging?replies=3#post-6538553

You can disable this by commenting out the following line as per the support article above

I had to comment the line 86 (//wp_insert_post( $log_entry );) in cloudflare_cachepurge.php.