Have adblock issues

Assuming you are behind a Fortgate firewall, use FortiVew and drill down on your device sessions and/or use the web filter log to see why it is allowing this traffic.

Usually with Google Chrome (or any other web browsers) that use the QUIC protocol, some UTM/security appliances may have trouble properly detecting this traffic.   Later versions of the Fortigate firmware can detect and block QUIC traffic via using an application sensor, but you need set it up.