Instantiated variables of a prefab + script

Just a blind guess, can't your property TileValue access a static variable?

I tried it both as a static var and not. Using a static var would not compile for me. I'll post the whole script later...

can you post both scripts: the tiledata script and the script that is using it?

tiledata script:

 using UnityEngine;
 using System;
 using System.Collections.Generic;
 
 public class tiledata : $$anonymous$$onoBehaviour {
 
     public int TileValue;
 
     // Use this for initialization
     void Awake () 
     {
         TileValue = 10;
     }

}

The script calling up tiledata:

     using UnityEngine;
     using UnityEngine.UI;
     using System.Collections;
 
     public class hostiles : $$anonymous$$onoBehaviour {
 
     public GameObject[] TileArray;
 
     Text text;
 
     void HostileSpawner () 
     {
         TileArray = GameObject.FindGameObjectsWithTag ("Tile") ;
                 
         for (int i = 0; i < TileArray.Length; i++) 
         {
             print ("Tile " +i+ " Position:" +TileArray[i].transform.position+ " Tile Value " +TileArray[i].GetComponent<tiledata>().TileValue);
 
             TileArray[i].GetComponent<tiledata>().TileValue +=1;
 
             text.text = "" +TileArray[i].GetComponent<tiledata>().TileValue;
 
         }
 }
 
     void Start () 
     {
         text = GetComponent <Text> ();
         InvokeRepeating ("HostileSpawner", 0, 2);
     }
 }

can you change your function to this:

  void HostileSpawner () 
  {
      TileArray = GameObject.FindGameObjectsWithTag ("Tile") ;
              
      for (int i = 0; i < TileArray.Length; i++) 
      {
          tiledata data = TileArray[i].GetComponent<tiledata>();
              
          print ("Tile " + i + " Position:" + TileArray[i].transform.position + " Tile Value " + data.TileValue);
  
          data.TileValue += 1;
  
          text.text = data.TileValue.ToString();
  
          print (data.TileValue);
      }
 }

and post what is printed to your unity console?

if you just need a tile data in that increases each time a tile is spawned couldnt you have the tiledata vallued stored on a seperate script like a game manager script then for the title data script have an int called thisTileValue then find the game manager script the have the tiledata value then use

 gamemanger.titledata = gamemanger.titledata + 1; 
 thisTileValue = gamemanger.tiledata;

here is an example for you I have a game object called gm with a script called gm on it using UnityEngine; using System.Collections;

 public class gm : $$anonymous$$onoBehaviour {
     public int tileValue;
 
     void Start () 
     {
         tileValue = 10;    
     }
 }

I then have another game object called tile with the following script

 using UnityEngine;
 using System.Collections;
 
 public class tilevalue : $$anonymous$$onoBehaviour {
     public gm gm;
     public int thisTileValue;
     void Start () 
     {
         gm = GameObject.Find ("gm").GetComponent<gm>();
         gm.tileValue = gm.tileValue + 1;
         thisTileValue = gm.tileValue;
     }
 }