RSSI is not logging in the data flash log

I am using Pixhawk orange cube plus, with Skydroid T12 receiver, RSSI is enabled in the parameter list, RSSI_type is set to 5, Still I am not getting the Signal strength. please suggest which parameters should be enabled and what hardware changes are required. I am getting the the RSSI data from the tlog but it is not showing only static graph. I need a dynamic graph showing the RSSI strength during the whole flight.
Log file (.bin File ) : https://drive.google.com/file/d/1PuyfHZhpXReD9OBhOxJ5tOzEoqWhSalS/view?usp=sharing