turning on single port results in all port turned on

We are using YKUSH usb hub. When i tried to POWER ON single port then all 3 port becomes ON.
We are using below command to power ON individually
ex. **ykushcmd.exe -s YK16997 -u 1**
For power OFF all we are using **ykushcmd.exe -a**

can you please help here to resolve the same.