perlin noise mesh or texture mess up?

[dull helm]

this generates the meshes

//Script #1
public static class MeshGenerator
{
    public static MeshData GenerateTerrainMesh(float[,] heightMap)
    {
        int width = heightMap.GetLength(0);
        int height = heightMap.GetLength(1);
        float topLeftX = (width - 1) / -2f;
        float topLeftZ = (height - 1) / 2f;

        MeshData meshData = new MeshData(width, height);
        int vertexIndex = 0;

        for (int y = 0; y < height; y++)
        {
            for (int x = 0; x < width; x++)
            {
                meshData.vertices[vertexIndex] = new Vector3(topLeftX + x, heightMap[x, y], topLeftZ - y);
                meshData.uvs[vertexIndex] = new Vector2(topLeftZ / (float)width, y / (float)height);

                if(x < width - 1 && y < height - 1)
                {
                    meshData.AddTriangle(vertexIndex, vertexIndex + width + 1, vertexIndex + width);
                    meshData.AddTriangle(vertexIndex + width + 1, vertexIndex, vertexIndex + 1);
                }

                vertexIndex++;
            }
        }

        return meshData;
    }
}

public class MeshData
{
    public Vector3[] vertices;
    public int[] triangles;

    public Vector2[] uvs;

    int triangleIndex;

    public MeshData(int meshWidth, int meshHeight)
    {
        vertices = new Vector3[meshWidth * meshHeight];
        uvs = new Vector2[meshWidth * meshHeight];
        triangles = new int[(meshWidth - 1) * (meshHeight - 1) * 6];
    }

    public void AddTriangle(int a, int b, int c)
    {
        triangles[triangleIndex] = a;
        triangles[triangleIndex + 1] = b;
        triangles[triangleIndex + 2] = c;
        triangleIndex += 3;
    }

    public Mesh CreateMesh()
    {
        Mesh mesh = new Mesh();
        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.uv = uvs;
        mesh.RecalculateNormals();
        return mesh;
    }
}

Script #2 willl be on a text document because its too large

script num 3

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

public class MapDisplay : MonoBehaviour
{
    public Renderer textureRenderer;
    public MeshFilter meshFilter;
    public MeshRenderer meshRenderer;

    public void DrawTexture(Texture2D texture)
    {
        textureRenderer.sharedMaterial.mainTexture = texture;
        textureRenderer.transform.localScale = new Vector3(texture.width, 1, texture.height);
    }

    public void DrawMesh(MeshData meshData, Texture2D texture)
    {
        meshFilter.sharedMesh = meshData.CreateMesh();
        meshRenderer.sharedMaterial.mainTexture = texture;
    }
}

please can someone help me!

[minor junco]

Hi, I might be wrong but this looks like Sebastian Lague's tutorial?
If that's the case, I would recommend going line by line down your code and comparing to his code for the episode on GitHub. Often times we make small mistakes that aren't readily apparent without a reference.