I installed a bunch of Fibaro Motion Sensor ZW5 today, and two of them the hub is not recognizing motion. The device blinks to show me it's sensing motion, but looking at the hubitat device detail page, it never recognizes the motion. I looked at the logs and it's not sensing the motion.
I know these sensors work with Hubitat, because I have used two of them with a C-8 (and previously with a C-5 and C-7).
That being said, it is impossible to determine the issue in your situation without any details about your z-wave mesh, or z-wave logs focused on communications between the hub and the sensors.