Hi,
You can check the categorisation from below link:
https://securityhub.cisco.com/web/submit_urls
And if the category is not correct, from that portal you can request to re-categorised the site.
For the appliance it self, make sure that the appliance is getting the up to date version of the categorisation incremental updates.
You can check from CLI and issue 'version' command and check when the last update for categorisation engine for the appliance.
You can check from GUI as well -> Security Services -> Acceptable Use Controls and make sure the services are enabled and the update is showing your current date.
If its not showing your current date, check the setting for the automatic updates from
GUI -> System Administrations -> Upgrade and Update Settings -> and check if the settings are correct such as:
- routing table to get the updates is correct interface
- Connecting to Cisco Update Servers
- Do you require Proxy server to fetch the updates