Since it seems to be a integration over syslog from the integration guide, you can try and do a tcpdump on the QRadar to check if you are receiving more than one alert being forwarded from RSA to QRadar. If not, this is something needs to be sorted out from the RSA side. If you are getting the alerts but it's going to unknown, then also check the sim generic log source if it's not being properly tagged to your custom DSM. After you find it, you can map the unknown events accordingly.
#QRadar#Support#SupportMigration