One of my fixtures (Auro Spot Mover)has a low visual intensity but it says its at intensity of 100.

Only one fixture has this problem where you can visually see that it has a lower intensity than the other auro spot movers. But all of the fixtures are in the same settings with intensity and the grand master is 100%.

Check if the shutter/dimmer is working correctly, maybe the mover needs a reset to defaults or dimmer calibration.

Also open DMX input/output window in onyx and check if all movers get the same value on the dimmer channel.

Sounds like a fixture problem, maybe part of the LED engine is not working.