Falling Platform respawning with multiple clones?

Hello! I am trying to create falling platforms that respawn soon after, however, the platform often spawns multiple clones. Please can someone help me with the code so that the falling platform respawns once until it falls and is destroyed again? I have followed a tutorial and used these scripts. I have one script attached to the Platform itself and one attached to an empty Game Object called Platform Manager.

The script attached to the Platform is:

public class FallingPlatform : MonoBehaviour
{
private Rigidbody2D rb;
private Transform originalTransform;

// Use this for initialization
private void Start()
{
rb = GetComponent<Rigidbody2D>();
}

private void OnCollisionEnter2D(Collision2D col)
{
if (col.gameObject.name.Equals("Ellen"))
{

Invoke("DropPlatform", 0.5f);
respawn(gameObject, 2f);
}
}

private void InvokeRepeating(string v1, float v2)
{
throw new NotImplementedException();
}

private void respawn(GameObject gameObject, float v)
{
gameobject.transform.position = originalTransform.position
rb.isKinematic = true;
}

private void DropPlatform()
{
originalTransform = gameobject.transform;
rb.isKinematic = false;
}

The script attached to the Platform Manager is:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlatformManager : MonoBehaviour
{

public static PlatformManager Instance = null;

[SerializeField]
GameObject platformPrefab;

void Awake()
{
if (Instance == null)
Instance = this;
else if (Instance != this)
Destroy(gameObject);

}

IEnumerator SpawnPlatform(Vector2 spawnPosition)
{
yield return new WaitForSeconds(2f);
Instantiate(platformPrefab, spawnPosition, platformPrefab.transform.rotation);
}

}

Thank you in advance for any replies.

 

Use code tags

 

Sorry mate, this is my first time posting on the forums. Here you go.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlatformManager : MonoBehaviour
6. {
7.  
8.     public static PlatformManager Instance = null;
9.  
10.     [SerializeField]
11.     GameObject platformPrefab;
12.  
13.     void Awake()
14.     {
15.         if (Instance == null)
16.             Instance = this;
17.         else if (Instance != this)
18.             Destroy(gameObject);
19.  
20.     }
21.  
22.     IEnumerator SpawnPlatform(Vector2 spawnPosition)
23.     {
24.         yield return new WaitForSeconds(2f);
25.         Instantiate(platformPrefab, spawnPosition, platformPrefab.transform.rotation);
26.     }
27.  
28. }
29.  

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class FallingPlatform : MonoBehaviour
6. {
7.  
8.     Rigidbody2D rb;
9.  
10.     // Use this for initialization
11.     void Start()
12.     {
13.         rb = GetComponent<Rigidbody2D>();
14.     }
15.  
16.     void OnCollisionEnter2D(Collision2D col)
17.     {
18.         if (col.gameObject.name.Equals("Player-Johnny"))
19.         {
20.             PlatformManager.Instance.StartCoroutine("SpawnPlatform",
21.                     new Vector2(transform.position.x, transform.position.y));
22.             Invoke("DropPlatform", 0.5f);
23.             Destroy(gameObject, 2f);
24.         }
25.     }
26.  
27.     void DropPlatform()
28.     {
29.         rb.isKinematic = false;
30.     }
31. }
32.