Array indexing problem

I am trying to get my code to cycle through an array when I press a button and it works for the most part, but some of the colors don't change. For instance, the order is supposed to be: white, red, orange, yellow, green, blue, purple, pink, and then back to white. The order it actually goes in is: white, red, yellow, yellow, green, blue, pink, pink, and then back to white.

 using UnityEngine;
 using System.Collections;
 
 public class InputScript : MonoBehaviour {
 
     public KeyCode UpKey = KeyCode.UpArrow;
     public KeyCode DownKey = KeyCode.DownArrow;
     public KeyCode ChangeColorKey = KeyCode.Backslash;
     SpriteRenderer Sprite;
 
     int CurrentColor = 0;
 
     Color[] Colors;
 
     PongPaddleScript PaddleScript;
 
     // Use this for initialization
     void Start () {
         PaddleScript = GetComponent<PongPaddleScript>();
         Sprite = GetComponent<SpriteRenderer>();
 
         Colors = new Color[8];
         // White
         Colors[0] = new Color(255, 255, 255, 255);
         // Red
         Colors[1] = new Color(255, 0, 0, 255);
         // Orange
         Colors[2] = new Color(255, 102, 0, 255);
         // Yellow
         Colors[3] = new Color(255, 255, 0, 255);
         // Green
         Colors[4] = new Color(0, 255, 0, 255);
         // Blue
         Colors[5] = new Color(0, 0, 255, 255);
         // Purple
         Colors[6] = new Color(128, 0, 255, 255);
         // Pink
         Colors[7] = new Color(255, 0, 238, 255);
     }
     
     // Update is called once per frame
     void Update ()
     {
         if(Input.GetKey(UpKey))
         {
             PaddleScript.setDirection(1);
         }
         else if(Input.GetKey(DownKey))
         {
             PaddleScript.setDirection(-1);
         }
         else
         {
             PaddleScript.setDirection(0);
         }
 
         if(Input.GetKeyDown(ChangeColorKey))
         {
             if(CurrentColor + 1 > Colors.Length - 1)
             {
                 CurrentColor = 0;
             }
             else
             {
                 CurrentColor += 1;
             }    
             Sprite.color = Colors[CurrentColor];
         }
     }
 }