Continue Action in URL filtering not working as expected

Why is URL filtering not presenting a Block-continue page for each website in the URL category with Action "Continue".

• Palo Alto Firewalls
• Supported PAN-OS
• URL Filtering

1. The blocked URL entries for users per category is cached (not per URL)
2. For this reason, the user is not presented with block-continue page for each website in the same URL category
3. The URL Continue Timeout configuration can be configured under Device> Setup> Content-ID> URL filtering. 
   
   
4. Once the timeout value has been reached, the user will be presented with a new block-continue page and must click Continue to further access to the URL.   

Difference Between Block-Continue And Continue In URL Filtering Logs: