UI Canvas position issues

I have several problems with positioning canvas elements via c# script. The text is too small. The image element and text element are moved up from the parent container. For example, although I position Y as 0 in the code, the text element after starting at the Y coordinate has 576.7371

 private void SetPositionForItemGroup(RectTransform rect, RectTransform rectParent)
 {
     rect.anchoredPosition = rectParent.position;
     rect.anchorMin = new Vector2(0, 1);
     rect.anchorMax = new Vector2(0, 1);
     rect.pivot = new Vector2(0.5f, 0.5f);
     rect.sizeDelta = new Vector2(rectParent.rect.size.x, 50);
 }
 
 private void SetPositionForItemIcon(RectTransform rect, RectTransform rectParent)
 {
     // rect.anchoredPosition = rectParent.position;
     rect.anchorMin = new Vector2(0, 0.5f);
     rect.anchorMax = new Vector2(0, 0.5f);
     rect.pivot = new Vector2(0.5f, 0.5f);
     rect.sizeDelta = new Vector2(50, 50); // width and height
     rect.transform.position = new Vector3(50, 0, 0); // padding left 50
 }
 
 private void SetPositionForItemText(RectTransform rect, RectTransform rectParent)
 {
     // rect.anchoredPosition = rectParent.position;
     rect.anchorMin = new Vector2(0, 0.5f);
     rect.anchorMax = new Vector2(0, 0.5f);
     rect.pivot = new Vector2(0.5f, 0.5f);
     rect.sizeDelta = new Vector2(rectParent.rect.size.x - 105, 50); // width and height
     rect.transform.position = new Vector3(255, 0, 0); // padding left 255
 }


 

Thanks