I have just unplugged all the fans and tried every fan in port 1 and they all work. I kept fan 1 in port 1 and tried all the other fans in port 2. It seems to only display half the LED so might be a fault with port 2 itself rather than the fans.
Just to clarify something as well please. When I go to ICUE to configure the lighting as the attached pic, it show LED Port 1 as red, 2 as yellow, 3 as green etc. On my fans when configuring it counts the LEDs so Fan 1 LED 1 is red, Fan 1 LED 2 is yellow etc. Does yours do the same when you go to configure or does it show a full fan colour correctly? I assume it would show one LED on each fan that is connected
I will try my other RGB Hub again and test each fan again on that and see what shows