Auto redirect to root folder

When I connect on below link, website will auto redirect to new url:

Code:

http://localhost:8888/ci4/public/admin
redirect to http://localhost:8888/admin

http://localhost:8888/ci4/public/admin/
redirect to http://localhost:8888/admin

http://localhost:8888/ci4/public/admin/auth/
redirect to http://localhost:8888/admin/auth

But when I connect to "http://localhost:8888/ci4/public/admin.html", and routes realized that i connect to V_admin Controllers, and website has print contents of admin page.
I think the issue here is when i connect a folders not exists, website will auto redirect to root folder. On my source code, I set V_admin for admin controllers.
My Routes:

Code:

$routes->group('/admin', function($routes)
{
    //    Authentication
    $routes->add('auth.html', 'VAdmin\Controllers\Auth::index');
    $routes->add('auth/(:alpha).html', 'VAdmin\Controllers\Auth::index/$1');
    
    $routes->add('blog',  'Admin\Blog::index');
});
$routes->add('/admin', 'VAdmin\V_admin::index');

I don't know how to fix it or find any problems with my localhost. I used MAMP Pro on Mac Sierra. And CI3 run very well.
I asked on Github but I closed it after i read rules, so I post here, please help.
https://github.com/bcit-ci/CodeIgniter4/issues/703