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Can't log in with dash-flask-login on firefox and chrome while on edge it works

Hello I have created login system for dash app exactly as it is in the example with external package dash-flask-login but I have a problem that it just do not log in. The problem looks basically like this: I am entering login data and passwort, hitting submit and after this current_user.is_authenticated returns True but the page redirects(refreshes) and then it returns False. It seems like it just forget User data while it redirects. When I run my app on edge everythingn works as intended. There are my callbacks:

@login_app.callback(
            Output('h1', 'n_clicks'),
            [Input('submit-button', 'n_clicks')],
            [State('uname-box', 'value'),
             State('pwd-box', 'value')]
        )
def login(n_clicks, uname, pwd):
    print(current_user.is_authenticated)
    if uname:
        user = User.query.filter_by(username = uname).first()
        if user is None or not user.check_password(pwd):
            print('error')
        login_user(user)
        print(current_user)
        print(user.is_authenticated)
        return True
    else:
        pass


@server.route('/login/', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated and request.method == 'POST':
        if request.args.get('next'):
            return redirect(request.args.get('next'))
        else:
            return redirect('/login/')
    else:
        return redirect('/')


@login_manager.user_loader
def load_user(id):
    return User.query.filter_by(id=id).first()

While logging in firefox console reports this error:
Unhandled promise rejection TypeError: "NetworkError when attempting to fetch resource." [dash_renderer.min.js:12:23109](https://unpkg.com/dash-renderer@0.14.3/dash_renderer/dash_renderer.min.js)

How to handle this problem? The problem started when I have implemented User model with database. When I was using this example snippet with ‘fake users’ it worked aswell:

@login_app.callback(
            Output('h1', 'n_clicks'),
            [Input('submit-button', 'n_clicks')],
            [State('uname-box', 'value'),
             State('pwd-box', 'value')]
        )
def login(n_clicks, uname, pwd):

    if uname == 'user' and pwd == 'password':
        login_user(load_user(users[0].name))

else:pass