you need a proper hub the fact only 1 is mining and giving really bad stats shows that the usb hub cant handle much if theres 4 erupters and only 2 are showing then theres not even enough power to power them all up
LOGILINK 10 port USB 2.0 HUB
The fast hub of LogiLink supports the modern USB 2.0 standard with up to 480 MBit/s and extends your connection by 10 more ports.
Naturally you can also connect all devices of the older USB generations. This convenient hub in noble design draws all attention to itself and is also very powerful.
A 220 volt power supply with 3.5 ampere is included in the delivery.
Every Eruptor USB usses 560 milliampere , 560x 4 = 2,24A
I cant seem to find the qlue why it wont work?