Feedback Updating text through script causes weird flick in the animation

https://hastebin.com/xuqekudede.cs

Hey there, this has been bugging me for a day and I couldn't have figured out how to fix this issue.
Basically I have an Input field and a text which is the (_ _ _ _ _ _) lines in the picture, and when a user types in the code if it's wrong it will play the animation and move the wrong code, but as you can see in the gyazo it gives kind of flicker and I'm pretty sure it's these two lines that are responsible for that

Code (CSharp):

1.  if (called)
2.             {
3.                 all.Remove(all[0]);
4.                 all.Add("______");
5.             }

https://gyazo.com/2ddff7e124c976291b55fad0fc4094bf

 

The flicker looks more like some other kind of layout/alignment artifact, like the total height of the text transiently changed for one frame, that caused it to shift, then the next frame it went back to the normal height.

Do you have some layout mechanism on the text? Does the flicker go away if you temporarily disable that layout?

 

@Kurt-Dekker i'm not really sure what you mean

 

https://gyazo.com/a87d968b8cdfb12c2ab96102e51273fe