Why isn't this reticle's position correct?

[YoloJoe_1]

Hello everyone
I am trying to make the green square follow the box’ position on my HUD.
I am using a world space canvas for the HUD and a script I found online to follow the target’s position on the UI. The green square is a UI image.

Here is the script. I can’t see any reason why it is so much offset.

using UnityEngine;
using UnityEngine.UI;

public class ReticleOverEnemy : MonoBehaviour
{
    public RectTransform canvasRectT;
    public RectTransform reticle;
    public Transform objectToFollow;
    public Camera _camera;
    void Update()
    {
        Vector2 screenPoint = RectTransformUtility.WorldToScreenPoint(_camera, objectToFollow.position);
        reticle.anchoredPosition = screenPoint - canvasRectT.sizeDelta;
    }
}

Thanks in advance everyone

[YoloJoe_1]

Anyone? Please?