2 gpu's have lower hashrates on new rig. (All gpus identical, 8x 1060)

[twigmaester]

I just got a new rig yesterday with 8x zotac gtx 1060 ( https://i.redd.it/2oxvfu1nlwa01.jpg ). I dual mine sc + eth. The only problem I have is that 2 cards dont seem to cross 19 mh/s no matter what (others run between 22-23 mhs on eth). Should I call the store I got the rig from and report a problem with the GPU's? Or is it something I can fix?

[MATHReX]

The GPUs which are able to do 19 MH/s are probably Hynix cards.
The GPUs which are able to do 22-23 MH/s are either Micron or Samsung.
Hynix cannot perform more than 19 MH/s in ETH.