Question Animation glitch on mobile phone when tapping a button

I'm running into a strange issue with my 2D game, it seems to revolve around animations. Here is an example of what happens when I tap a button:

All it does is move the button to the right. When I do it though the game freezes, but it seems like stuff is still processing because after a fraction of a second it catches up. It only happens once as far as I can tell, after that, it never happens again. It only happens my phone (Moto X4), not on my computer. I'm not doing anything complicated. This is literally all the code I wrote for the application:

This is a test program I made only to show this glitch.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. public class Test : MonoBehaviour
5. {
6.     public GameObject Button;
7.     Vector3 testStart;
8.     void Start()
9.     {
10.         testStart = new Vector3(Button.transform.position.x + 500, Button.transform.position.y);
11.     }
12.     public void MoveButton()
13.     {
14.         StartCoroutine(Move());
15.     }
16.     IEnumerator Move()
17.     {
18.         while (Button.transform.position.x != testStart.x)
19.         {
20.             Button.transform.position = Vector2.MoveTowards(Button.transform.position, testStart, 600f * Time.deltaTime);
21.             yield return null;
22.         }
23.     }
24. }