I don’t think you have anything to worry about since it is working for you. Just cannot explain how it is working with the link records that are being displayed. I am sending you a PM with some additional data.
If you want to continue analyzing this situation but don’t want to pursue the approach in the PM, start the SHN Utility and Connect to the PLC. Double click on the blue T shaped Icon in the system tray to open the SDM3 window. Trigger each of the 5 motion sensors and post the trace data from the SDM3 window.