Problems with positioning game objects

Hello everyone,

I have a weird bug in my game and an issue I couldn't find anything about on here: When building a tower next to the location of a player avatar (there are two), the tower is sometimes built on the (0, 0)-position (it's a 2D-game) and doesn't register collisions correctly (the towers find their targets via a trigger collider and the towers positioned incorrectly fire on targets that are clearly outside their trigger). I tried logging the "pos"-variable and the tower's position after it's set and weirdly these positions are correct, but the tower is still spawned at (0, 0). Might there be a problem with my handling of inputs? Just to be safe I also included the movement-script for my player-avatars below since that's the only other script that uses player inputs up to now.

BuildTower-Script:

 public class BuildTower : MonoBehaviour {
 
     public GameObject prefab;
     GameObject tower;
     Vector3 pos;
     float delay = 0.5f;
     float lastTowerBuilt = 0;
 
     public int basicTowerPrice = 50;
 
     // Use this for initialization
     void Start () {
         pos = transform.position;
     }
 
     void Update () {
         pos = transform.position;
 
         if (gameObject.GetComponent<Properties>().playerTag == 1) 
             if(Input.GetKeyUp(KeyCode.Q)) {
                 if(Time.time - lastTowerBuilt > delay && GetComponent<Gold>().gold >= basicTowerPrice){
 
                     RaycastHit2D hit = Physics2D.Raycast(transform.position + new Vector3(-.6f, 0), new Vector2(-1, 0), .5f);
 
                     if(!hit.collider || hit.collider.isTrigger){
                         tower = Instantiate (prefab);
                         tower.transform.position = pos + new Vector3(-1, .5f, 0);
                         tower.GetComponent<Properties>().playerTag = 1;
                         lastTowerBuilt = Time.time;
 
                         PayForTower(basicTowerPrice);
                     }
                 }
             }
 
         if (gameObject.GetComponent<Properties>().playerTag == 2)
             if(Input.GetKeyUp(KeyCode.M)) {
                 if(Time.time - lastTowerBuilt > delay && GetComponent<Gold>().gold >= basicTowerPrice){
 
                     RaycastHit2D hit = Physics2D.Raycast(transform.position + new Vector3(.6f, 0), new Vector2(1, 0), .5f);
 
                     if(!hit.collider || hit.collider.isTrigger){
                         tower = Instantiate (prefab);
                         tower.transform.position = pos + new Vector3(1, .5f, 0);
                         tower.GetComponent<Properties>().playerTag = 2;
                         lastTowerBuilt = Time.time;
                         
                         PayForTower(basicTowerPrice);
                     }
             }
         }
     }
 
     void PayForTower(int price){
         GetComponent<Gold> ().gold -= price;
     }
 
 }

PlayerMovement-Script: using UnityEngine;

 public class PlayerMovement : MonoBehaviour
 {
     public float speed = 6f;            // The speed that the player will move at.
     
     Vector3 movement;                   // The vector to store the direction of the player's movement.
     Rigidbody2D playerRigidbody;          // Reference to the player's rigidbody.
 
     void Awake ()
     {
         
         // Set up references.
         playerRigidbody = GetComponent <Rigidbody2D> ();
     }
     
     
     void FixedUpdate ()
     {
         float h;
         float v;
 
         // Store the input axes.
         if ( GetComponent<Properties>().playerTag == 1 ) {
             h = Input.GetAxisRaw ("Horizontal1");
             v = Input.GetAxisRaw ("Vertical1");
         } else {
             h = Input.GetAxisRaw ("Horizontal2");
             v = Input.GetAxisRaw ("Vertical2");
         }
 
         // Move the player around the scene.
         Move (h, v);
     }
     
     void Move (float h, float v)
     {
         // Set the movement vector based on the axis input.
         movement.Set (h, v, 0);
         
         // Normalise the movement vector and make it proportional to the speed per second.
         movement = movement.normalized * speed * Time.deltaTime;
 
         transform.position += movement;
     }
 }