FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Problem: Portions of a page are not displaying correctly.
Cause: One possible reason is that the website pulls information from  a third party website.

To determine whether that is the case, use urlfilter debug with a filter applied.

1) Identify the IP address of the test PC
2) Use the following commands to collect information on URLs being queried due to web browsing on the test PC:

# diagnose debug reset
# diagnose debug urlfilter src-addr <IP address of test PC>
# diagnose debug application urlfilter -1
# diagnose debug en

This command will display all the websites that are being contacted to build up all the necessary pictures, icons and information for that specific website.