@wahxwah URL is the url user is trying to access as taken from the HTTP header, or as in your case of encrypted traffic, from the SSL Certificate.
Destination is the actual destination IP of the session.
I am not sure why you are getting the output in the below, but there will be more information if you can share the detailed log. I wonder if you have selected the "Resolve hostname" checkbox at the bottom of the screen and the firewall is trying to do reverse lookup for the IP.
I got the captioned screenshot from Monitor > URL Filtering section.
Detailed, pls refer to the new screenshot
@BatD has it correct. You have "Resolve hostname" checked at the bottom of the page. Uncheck it and it will list IP's only.
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