Cron Running Twice?

I have the following cron job set up in cPanel with ServInt:

Code: 
0 * * * * curl -s -o /dev/null http://www.example.com/some_script.php
This script runs and then emails me the results, but for some reason it is running twice each hour, sending me two emails.

On my old host this didn't happen, so I am confused as to how I would fix it. Any help is appreciated.

 

 

 

 

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