Сайт на flask не грузит у некоторых пользователей

У некоторых пользователей не грузит сайт(белый экран),я пробывал хостить сайт,используя ngrok,а также пытался хостить на VDS

Вот код сайта:

import json
from threading import Lock

import requests
from flask import Flask, redirect, render_template, request, url_for
from pyngrok import conf, ngrok
from settings import MAIN_SETTINGS
from utils import decrypt, encrypt, logger
from waitress import serve

THREADING_LOCK = Lock()
app = Flask(__name__,static_folder='static',template_folder='templates')
#pyngrok_config = conf.PyngrokConfig(auth_token=MAIN_SETTINGS.NGROK_AUTH_TOKEN,region='eu')

#_ngrok_server=ngrok.connect(addr=5000,proto='http',pyngrok_config=pyngrok_config,bind_tls=False)

MAIN_ADDRESS ='http://x.x.x.x' #_ngrok_server.public_url
API_URL= 'None' #_ngrok_server.api_url

PASSED={}

def generate_url(url: str,id: int)-> str:
    logger.debug(f'Generating url({url}) for #{id}')
    url=encrypt(MAIN_SETTINGS.KEY,json.dumps({'url':url,'id':id}))
    return MAIN_ADDRESS+'/captcha?id='+url

def get_passed(id:int):
    global PASSED
    if str(id) in PASSED.keys() and PASSED[str(id)]==True:
        with THREADING_LOCK:
            del PASSED[str(id)]
        return True
    else:
        return False

@app.route("/captcha", methods=["GET"])
def captcha():
    args=request.args
    try:
            json_obj=decrypt(MAIN_SETTINGS.KEY,args.get('id'))
            _temp=json.loads(json_obj)
            logger.debug(f'User {_temp["id"]} visited link')
    except Exception as e:
        return "Something went wrong. Please try again"
    
    return  render_template("captcha.html",site_key=MAIN_SETTINGS.HCAPTCHA_SITE_KEY,bot_name=MAIN_SETTINGS.BOT_NAME)

@app.route('/captcha',methods=['POST'])
def passed_captcha():
    global PASSED
    args=request.args
    h_captcha_response=(request.get_data(as_text=True))
    if h_captcha_response.find('h-captcha-response=')==-1:
        return "Wrong captcha response"
    try:
        h_captcha_response=h_captcha_response[h_captcha_response.find('h-captcha-response=')+len('h-captcha-response='):]
    except:
        logger.warning("Invalid captcha response %s",h_captcha_response)
        return "Wrong captcha response\nTry again..."
    data = { 'secret':MAIN_SETTINGS.HCAPTCHA_SECRET_KEY, 'response':h_captcha_response }
    try:
        response=requests.post("https://hcaptcha.com/siteverify",data=data)
        result=response.json()["success"] if response.status_code == 200 else False
    except:
        return redirect(request.base_url+request.full_path)
    if result==True and args:
        try:
            json_obj=decrypt(MAIN_SETTINGS.KEY,args.get('id'))
            _temp=json.loads(json_obj)
            url=_temp['url']
            if _temp['id']!=-1:
                with THREADING_LOCK:
                    PASSED[str(_temp['id'])]=True
        except Exception as e:
            return "Wrong task id"
        logger.debug(f'User {_temp["id"]} passed captcha')
        return redirect(url)
    else:
        return captcha()
    
@app.errorhandler(404) 
@app.route('/')
def main_page(exception=None):
    return 'Hello from admins ;)'
    
def run_site():
    """
    For windows you must open 80 port:
    netsh advfirewall firewall add rule name="TCP Port 80" dir=in action=allow protocol=TCP localport=80
    
    """
    serve(app,host='0.0.0.0',_quiet=True, port=80)
    

В чем заключается проблема?
Хочу заметить, что GET запрос от проблемных пользователей присутствует