Hi jamie Mai,
This sometimes happens due to incorrect configuration of the L4TM in the WSA.
To verify, go to GUI> Security Services> L4 traffic Monitor> Edit Global Settings and make sure the option to 'All Ports Except Web Ports (HTTP/HTTPS) is selected.
Thanks & Regards,
Kushagra Srivastava
Cisco PDI Technical Advisors
http://www.cisco.com/go/pdi