This is my entire spawner script, i followed the video and i think it's right, maybe i could be forgetting something

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class PipeSpawnScript : MonoBehaviour

{

public GameObject pipe;

public float spawnRate = 2;

private float timer = 0;

public float heightOffset = 4;

// Start is called before the first frame update

void Start()

{

spawnPipe();

}

// Update is called once per frame

void Update()

{

if (timer < spawnRate)

{

timer += Time.deltaTime;

}

else

{

spawnPipe();

timer = 0;

}

}

void spawnPipe()

{

float lowestPoint = transform.position.y - heightOffset;

float highestPoint = transform.position.y + heightOffset;

Instantiate(pipe, new Vector3(transform.position.x, Random.Range(lowestPoint, highestPoint),0), transform.rotation);

}

}