When using auth middleware, its redirecting me to home page

I am new in laravel app development. When I am using auth middleware, then it works fine for unregistered user(redirecting to login page). But when logged user going to visit that page, then its redirecting to home page (root directory).

below the route from routes.php code is

Route::group(['middleware' => 'auth'], function () {
    Route::resource('/edit', 'userController@edit');
});

Below my userController.php code is

<?php
 namespace App\Http\Controllers;
 use Illuminate\Http\Request;
 use App\Http\Requests;
 use App\allUsers;
 class userController extends Controller
 {
     public function index(){
     }

     public function show($id){
     }

     public function edit(){
         return view('auth.user_edit');
     }
  }

Below my authController code is

<?php

 namespace App\Http\Controllers\Auth;

 use App\User;
 use Validator;
 use App\Http\Controllers\Controller;
 use Illuminate\Foundation\Auth\ThrottlesLogins;
 use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;

class AuthController extends Controller
 {
 /*
     |--------------------------------------------------------------------------
| Registration & Login Controller
|--------------------------------------------------------------------------
|
| This controller handles the registration of new users, as well as the
| authentication of existing users. By default, this controller uses
| a simple trait to add these behaviors. Why don't you explore it?
|
*/

use AuthenticatesAndRegistersUsers, ThrottlesLogins;

/**
 * Where to redirect users after login / registration.
 *
 * @var string
 */
protected $redirectTo = '/dashboard';

/**
 * Create a new authentication controller instance.
 *
 * @return void
 */
public function __construct()
{
    $this->middleware($this->guestMiddleware(), ['except' => 'logout']);
}

/**
 * Get a validator for an incoming registration request.
 *
 * @param  array  $data
 * @return \Illuminate\Contracts\Validation\Validator
 */
protected function validator(array $data)
{
    return Validator::make($data, [
        'name' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|min:6|confirmed',
    ]);
}

/**
 * Create a new user instance after a valid registration.
 *
 * @param  array  $data
 * @return User
 */
protected function create(array $data)
{
    return User::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'password' => bcrypt($data['password']),
    ]);
}
}

Anyone help me please.

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