UI Text Get Canvas' Axis Line

Hey friends, I have some little problem with my UI Text and Canvas Axis, as you can see on first screenshot

you can zoom in on game scene (and only on game scene), there is a blurry line on the first C on "clicker" word. I've been trying to change the pivot and change another background but it's still happening, and if I try to play the game as you can see on second screenshot

you can still see the blurry line on that C character, but if I try to move the text, and the vertical axis of canvas not crossing the text, the blurry line is gone, help me, what should I do?

and I'm using Unity 5.6, latest version

EDIT:

It's happening also on 3D mode, and every text UI including button with text children as I remember it's not happening on unity 5.5