why do my instantiated prefabs spawn depending on the position / rotation of the globe?

i have a globe which spins by its self and when the player clicks and drags the globe they can drag it into what ever position the wish. i have it where when a specific button is pressed, buildings are instantiated onto the globe but they dont always spawn in the right orientation on the globe i.e. on their side, upside down etc. i have a feeling its to do with the position of the camera but im not too sure! how do i fix this? i am a bit of a beginner so i am unsure where i have gone wrong.

here is my rotate script where the player can click and drag the globe

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class rotateEarth : MonoBehaviour
 {
     Vector3 mPrevPos = Vector3.zero;
     Vector3 mPosDelta = Vector3.zero;
     public EarthSpinScript earthSpin;
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetMouseButton(0))
         {
 
             mPosDelta = Input.mousePosition - mPrevPos;
             if (Vector3.Dot(transform.up, Vector3.up) >= 0)
             {
 
                 transform.Rotate(transform.up, -Vector3.Dot(mPosDelta, Camera.main.transform.right), Space.World);
             }
 
             else
             {
 
                 transform.Rotate(transform.up, Vector3.Dot(mPosDelta, Camera.main.transform.right), Space.World);
             }
 
             transform.Rotate(Camera.main.transform.right, Vector3.Dot(mPosDelta, Camera.main.transform.up), Space.World);
 
         }
 
 
 
         mPrevPos = Input.mousePosition;
 
 
         earthSpin.spinEarth = false;
         earthSpin.spinEarth = true;
        
      
     }
 }

here is my instantiate script

 public class Spawner : MonoBehaviour
 {
     public Transform[] spawnLocations;
     public GameObject[] WhatToSpawnPrefab;
     public GameObject[] WhatToSpawnClone;
     public bool alreadyInstantiated;
 
 
 
     public void Update()
 
     {
 
 
 
         SpawnBuilding();
 
 
 
         void SpawnBuilding()
 
 
         {
             if (Input.GetKeyDown("1") && !alreadyInstantiated)
 
             {
                 alreadyInstantiated = true;
 
                 GameObject go = Instantiate(WhatToSpawnPrefab[0], spawnLocations[0].transform.position, Quaternion.Euler(85, 90, 360)) as GameObject;
                 go.transform.parent = GameObject.Find("Globe").transform;
             }
 
             else
             {
                 alreadyInstantiated = false;
             }
         }
 
     }
 
 }

and here is my earth spinning script

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class EarthSpinScript : MonoBehaviour
 {
     public float speed = 10f;
     public bool spinEarth = false;
    
 
    
     //globe spins
 
 
     void Update()
 
     {
         if (spinEarth) 
 
 
         {
             transform.Rotate(Vector3.up, speed * Time.deltaTime, Space.World);
 
         }
 
         
 
     }
 
     public void StopSpinning()
     {
         spinEarth = false;
 
     }
 
     public void StartSpinning()
     {
         spinEarth = true;
     }
 }

hopefully you can spot something in my scripts because I'm puzzled!

thank you in advance!