got a new 144hz monitor but getting horizontal white lines at 144? help pls

[TinkyWinky]

So i bought an Asus VG248QE monitor (144hz) from amazon and it just came in today and i get these very light white thin horizontal white lines only in the middle of my screen. When i go 120hz/144hz, is when i see them. But when i go 60hz theres no white lines. Anyone know what the issue might be?

[Cathulhu]

Why are you not posting in Hardware and Operating Systems (Link)?