Raycast.hitpoint always returning back to the camera

Hello,

Here is a video of my problem : https://youtu.be/F9hCJ9Y9Tcg

I have a ground, and I want to place a sort of building on it. In the game the player have to click on a button, choose the emplacement, and valid by re-clicking again. (like in any RTS game)

For that I use a Raycast, and I instantiate the building on the hitPoint. The problem is : the hitPoint go from the ground to the camera, and again, and again, ... And I can't understand why :/

If anyone can help me...

This is a part of my code :

     void Update () 
     {
     
         if(lookingForSpot == true)
         {
             RaycastHit  hit;
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             
             if(Physics.Raycast (ray, out hit)) 
             {
                 Vector3 hitPoint = hit.point;
                 Vector3 constructionPoint = hit.barycentricCoordinate;
                 //hitPoint.y = 0.1f;
                 
                   Debug.DrawLine(Camera.main.transform.position, hitPoint);
                 
                 if(isCreated == false)
                 {
                     buildingNumber += 1;
                     GameObject clone;
                     clone = Instantiate(statueA, hitPoint, Quaternion.Euler(270, 200, 0)) as GameObject;
                     clone.name = ("StatueA" + buildingNumber);
                     clone.tag = "EnConstruction";
                     isCreated = true;
                 }
                 
                 GameObject cloneb = GameObject.Find("StatueA" + buildingNumber);
                 cloneb.transform.position = hitPoint;
                 cloneb.GetComponent<Renderer>().material = constructionPositive;
                 
                 if(constructionColliderChecking == false)
                 {
                     cloneb.GetComponent<Renderer>().material = constructionPositive;
                     if(Input.GetButton("Fire1"))
                     {
                         lookingForSpot = false;    
                         cloneb.GetComponent<Renderer>().material = statueAmaterial;
                         cloneb.GetComponent<Collider>().isTrigger = false;
                         cloneb.AddComponent<CollisionConstructionChecking>();
                         cloneb.tag = "Construit";
                     }
                 }
                 
                 if(constructionColliderChecking == true)
                 {
                     cloneb.GetComponent<Renderer>().material = constructionNegative;
                 }
                 
             }
         }
         
     }


     public void StatueConstruction (string buildingToConstruct)
     {
         isCreated = false;
         lookingForSpot = true;    
     }
     
     
 }