How to verify build-in app signatures and how to report false-positive app detections?

Hi, I haven't found a way to verify build-in app signatures so I could start debugging why FortiGate 60E / FortiOS 6.0.3 is detecting Ultrasurf_9.6+ VPN altough clearly there is no such app on the logged device.   Is there even a way to report Fortinet about false-positives in app signatures?