Text doesn't update correctly

So I've been working on my project recently, I was going to add a Wall Buy System (similar to COD Zombies) and everything it's working fine besides the UI.
I have a raycast that looks at an Wall Buy object with the tag "WallBuy" and display a message saying which weapon the player is buying and how many points it requires, but the problem is in play mode, when there's 2 Wall Buy objects with both the tag "WallBuy", only the first one that was added to the scene displays a message, but all the code for the message works (code below)

 string _text = "Press F to buy " + "(" + Manager.weaponList[index].WeaponIndex + ")" + Manager.weaponList[index].WeaponName + " for " + Manager.weaponList[index].pointsToBuy;  

full code:

     void Update()
     {
         if (...)
         {
            (...)
 
             if (Physics.Raycast(eyesPoint.position, eyesPoint.transform.forward, out RaycastHit hit))
             {
                 //Debug.Log(hit.transform + "/" + hit.transform.tag);
                 if (hit.transform == obj && obj.tag == "WallBuy" && hit.distance < 2)
                 {
                  Debug.Log(transform.name + " / " + Manager.weaponList[WpnIndex].WeaponIndex + " / " + WpnIndex + " / " + Manager.weaponList[WpnIndex].WeaponName);
                     this.Buy(this.WpnIndex);
                 }
                 else
                 {
                     text.text = "";
                 }
             }
         }
     }
     
     void Buy(int index)
     {
         string _text = "Press F to buy " + "(" + Manager.weaponList[index].WeaponIndex + ")" + Manager.weaponList[index].WeaponName + " for " + Manager.weaponList[index].pointsToBuy;
         if (isUsed != true && Manager.weaponList[index].isBuyable != false)
         {
             if(text.text == "")
             {
                 text.text = _text;
             }
             Debug.Log(text.text);
     }