What's wrong with your screenshot? All you need to do is hit the PrtScrn button, then go to Photoshop and make a new blank file, and Ctrl V to paste the screenshot into the blank file, then save it as a jpeg and upload it.
Don't worry about that, that's what the calibration is for. As long as the brightness is roughly in the ballpark, you can continue following the instructions.
Oh? What's strange about it? It's just a place to make the adjustments, which affect the whole screen.
May I see a photo of your screen, and its OSD, to make sure we're talking about the same thing?