When working with routes double check if those are cached. If so you'll see a routes.php file in bootstrap/cache folder.
After logout your controller redirects the user to the route named 'login'. This is probably contained in the routes/web.php. You must not give the same name to multiple routes. Make a route named admin_login. From the App\Http\Controllers\Admin\Auth\LogoutController.php make sure you redirect to it. Have a look at the extended class to see what method you have to override to change the route.
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