I have this problem with a OnePlus 3 and am on the *second* replacement digitizer assembly ( thought the first replacement that I got was defective) with the exact same problem: a strip down the left side of the screen is completely unresponsive, and then a portion of the right side of the screen causes phantom touches on the left (ie tapping the number 3 causes a simultaneous press on the 1 so I can't even enter my pin). This happens when the digitizer is not even seated, just sitting next to the mainboard with the ribbon cable connected and nothing else touching. I'm pretty stumped.