Mining Rig for hashcat

Hello lads, I have some problem with my RIG, launching the hashcat64,exe 

I got x6 RX 570 4gb nitro+. Using Blockchain Driver.. Have been mining for months, when I try to use hashcat now it seems only one GPU is hashing, in the beginning when I launch attack it appears that .exe can read all 6 GPUs but only GPU1 is used 100% the rest are showing 0%.. what might be causing the problem ?

All recommendations will be kindly appreciated.

Thank you in advance.

P.S. 
- Does it need OpenCL 2.0 Driver ?