Why is my script for a sprite applying to a tilemap? (Unity2D)

Question

I'm trying to make a simple top-down 2d movement demo as a personal project, and I've run into a very weird roadblock. I was using code from this website to move the sprite, and it worked fine. I then drew in a simple structure using tilemap to test movement and collision of the sprite, but now when I use the arrow keys it moves the structure I painted in with the tilemap in an inverted control scheme (up arrow is down, left arrow is right, etc.). I have the script I wrote for the test sprite attached below. Can anyone help?

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

public class PlayerController : MonoBehaviour
{
    Rigidbody2D body;

    float horizontal;
    float vertical;
    Vector2 move;

    public float runSpeed = 2.5f;

    void Start()
    {
        body = GetComponent<Rigidbody2D>();
    }

    void Update ()
    {
        horizontal = Input.GetAxis("Horizontal");
        vertical = Input.GetAxis("Vertical"); 
        //move.x = horizontal;
        //move.y = vertical;
    }

    private void FixedUpdate()
    {  
        body.velocity = new Vector2(horizontal * runSpeed, vertical * runSpeed);
    }
}

Answer 1

I know it was much worse but could you try? :)

body.velocity = new Vector2(-horizontal * runSpeed, -vertical * runSpeed);