[Windows Central Question]

I notice an unusual black shade diffuses while i swipe for navigation. It seem pretty annoyed to me. when I turn my display in light version this problem doesnt occur. what to do? By the way I just have bought lumia 730 after getting so many positive feedback in the internet. even though I didnt get good service from my previous lumia set that was lumia 620 which I threw away, I decided to get new one in the hope of bettrer service .