Scroll rect Autoscroll script almost working

Ok so in my project I'm creating the items menu and I made a scroll rect for it. After researching and finding out that autoscroll wasn't available already in Unity. I found a bunch of different scripts, but only one is almost working. It scrolls like I need it to, but It doesn't scroll all the way to the end of my item buttons/content. Can someone help me figure out what's wrong? Thanks in advance!!

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.EventSystems;
  
 [RequireComponent( typeof( ScrollRect ) )]
 public class ScrollToSelected : MonoBehaviour {
  
 public float scrollSpeed = 10f;
  
 ScrollRect m_ScrollRect;
 RectTransform m_RectTransform;
 RectTransform m_ContentRectTransform;
 RectTransform m_SelectedRectTransform;
  
 void Awake() {
     m_ScrollRect = GetComponent<ScrollRect>();
     m_RectTransform = GetComponent<RectTransform>();
     m_ContentRectTransform = m_ScrollRect.content;
 }
  
 void Update() {
     UpdateScrollToSelected();
 }
  
 void UpdateScrollToSelected() {
  
 // grab the current selected from the eventsystem
     GameObject selected = EventSystem.current.currentSelectedGameObject;
  
 if ( selected == null ) {
     return;
 }
 if ( selected.transform.parent != m_ContentRectTransform.transform ) {
     return;
 }
  
 m_SelectedRectTransform = selected.GetComponent<RectTransform>();
  
 // math stuff
     Vector3 selectedDifference = m_RectTransform.localPosition - m_SelectedRectTransform.localPosition;
     float contentHeightDifference = ( m_ContentRectTransform.rect.height - m_RectTransform.rect.height );
  
     float selectedPosition = ( m_ContentRectTransform.rect.height - selectedDifference.y );
     float currentScrollRectPosition = m_ScrollRect.normalizedPosition.y * contentHeightDifference;
     float above = currentScrollRectPosition - ( m_SelectedRectTransform.rect.height / 2 ) + m_RectTransform.rect.height;
     float below = currentScrollRectPosition + ( m_SelectedRectTransform.rect.height / 2 );
  
 // check if selected is out of bounds
     if ( selectedPosition > above ) {
         float step = selectedPosition - above;
         float newY = currentScrollRectPosition + step;
         float newNormalizedY = newY / contentHeightDifference;
         m_ScrollRect.normalizedPosition = Vector2.Lerp( m_ScrollRect.normalizedPosition, new Vector2( 0, newNormalizedY ), scrollSpeed * Time.deltaTime );
     } else if ( selectedPosition < below ) {
         float step = selectedPosition - below;
         float newY = currentScrollRectPosition + step;
         float newNormalizedY = newY / contentHeightDifference;
         m_ScrollRect.normalizedPosition = Vector2.Lerp( m_ScrollRect.normalizedPosition, new Vector2( 0, newNormalizedY ), scrollSpeed * Time.deltaTime );
     }
  
 }
  
 }