Micro Dot Phat one column dead on two display

I found the middle two displays have one column both which will not light up:

I check the data sheet here: http://blog.pimoroni.com/micro-dot-phat/

I think it should be because of Pin 8. I did try to solder again on the Pin 8 on both display but still the same.

Any suggestions to solve this out?

Not pretty but seems to works on other displays