Same collider on server behaving different for each client?

Well, I'm having a simple multiplayer game where 2 players can connect and play on a simple level filled with some platforms where the players can jump on.

My problem is that my platform colliders are coded like this:

 void Update () {
         if (GetComponent<Renderer>().isVisible)
         {
             if (transform.position.y > GameObject.Find("Player(Clone)").transform.position.y)
             {
                 (gameObject.GetComponent(typeof(Collider)) as Collider).isTrigger = true;
             }
             else if ((transform.position.y + 0.5f) < GameObject.Find("Player(Clone)").transform.position.y)
             {
                 (gameObject.GetComponent(typeof(Collider)) as Collider).isTrigger = false;
             }
             
         }
     }

So, this code will detect if the player Y position is lower or higher than the platform's position and will activate/deactivate (turn to "is Trigger") the box collider based on this logic. If the player is under the platform, the collider is a trigger, if the player is over the platform the collider is collider.

This works pretty fine on a single player mode, now, the problem is that I instantiate this platforms on the server and the server of course spawns this platforms on each client. What happens now is that when one of the players jumps over a platform, the other can't jump through that platforms anymore as the platforms have their colliders active because of the first player being over them.

Is there any way I can accomplish this, keeping the platforms instantiated on the server. I need it to work like this because I need to be able to destroy platforms and they should be the same on both clients. So it should be the same platform and when I "destroy" it in gameplay it should disappear logically for both clients.

So, how could a I have the same collider on the server behaving different for each client?