1. Are your RFID tags geo-referenced? If your GuardTrax device loses GPS then your RFID tags won't appear on the Tracking page unless they are properly geo-referenced. 
(see video: RFID Tag Set Up) 
2. Are your RFID tags set up to create alerts and Map? Both the Create Alerts and Map RFID checkboxes MUST be checked off for the scanned RFID tags to appear on the map and on the reports. 
(see video: RFID Tag Set Up) 
3. Is your RFID alert turned on? 
(see video: Alert Set Up)