'01 Chevy Blazer windshield wipers missing spot on windshield?

So when you're inside the car and looking at the windshield, the wiper on the left seems to be missing this huge spot right in the middle of the way it's supposed to be wiping, which in general is the spot where I look to drive lol. Does anyone know how to fix this? or what part I need to get to fix it? I have brand new wiper blades, they're the Rain X latitudes I think. So yeaaa.... I'm kinda thinkin maybe the whole arm that holds the wiper blade needs to be replaced but Idk