What I found interesting is with the image opened in Photoshop CS6 and zoomed on my LCD screen to 400%, I can see the 6 if it is scrolled to the top of the LCD screen. If I scroll it down to the bottom I can see the 2 and the 6 is very visible. Guess the LCD lamp is at the bottom of my screen perhaps. Not much difference in left to right though, or very slight.
I use an i1 PhotoPro 2 set to the 25 minute screen calibration too. I know the x-rite guys in their video claimed "No screens alike and only the factory can calibrate multiple zones of the screen" where we get to pick one and pray the rest fall into tolerance for color and brightness.