Animation flickers when combining with script

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