Please help! I am new to unity and coding. I am trying to set my level at axis x =10.75148 and axis z= 3 but when script runs x and z axis becomes negative

I am trying to set my level at axis x =10.75148 and axis z= 3 but when script runs x and z axis becomes negative. I am trying to make infinity levels on y axis. On Y axis it seems fine but x axis and z axis becomes negative once level parent object TileManager script runs. Tile manager position sets as axis x =10.75148 , axis Y = 0 and axis z= 3

Please kindly help someone.

Below is my Script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class TileManager : MonoBehaviour
 {
     // Start is called before the first frame update
 
     public GameObject[] tilePrefabs;
 
     private Transform playerTransform;
 
     private float spawnY = 115.9884f;
     private float tileLenght = 499.8616f;
     private float spawnX = 10.75148f;
     private float spawnZ = 3f;
 
     private int AmtOfTiles = 3;
     private List<GameObject> activeTiles;
     private int LastPrefabIndex = 0;
 
     private void Start()
     {
         activeTiles = new List<GameObject>();
         playerTransform = GameObject.FindGameObjectWithTag("Player").transform;
 
         for (int i = 0; i < AmtOfTiles; i++)
         {
             if (i < 2)
                 SpawnTile(0);
             else
                 SpawnTile();
         }
     }
 
     // Update is called once per frame
     private void Update()
     {
         if (playerTransform.position.y > (spawnY - AmtOfTiles * tileLenght))
         {
             SpawnTile();
             DeleteTile();
         }
 
     }
 
     private void SpawnTile(int prefabIndex = -1)
     {
         GameObject levelgo;
         if (prefabIndex == -1)
 
             levelgo = Instantiate(tilePrefabs[RandomPrefabIndex()]) as GameObject;
 
         else
             levelgo = Instantiate(tilePrefabs[prefabIndex]) as GameObject;
 
         levelgo.transform.SetParent(transform);
         levelgo.transform.position = Vector3.up * spawnY;
         
 
         spawnY += tileLenght;
       
         activeTiles.Add(levelgo);
     }
 
     private void DeleteTile()
     {
         Destroy(activeTiles[0]);
         activeTiles.RemoveAt(0);
     }
 
     private int RandomPrefabIndex()
 
     {
         if (tilePrefabs.Length <= 1)
             return 0;
         int randomIndex = LastPrefabIndex;
         while (randomIndex == LastPrefabIndex)
         {
             randomIndex = Random.Range(0, tilePrefabs.Length);
         }
         LastPrefabIndex = randomIndex;
         return randomIndex;
     }
 
 }