Laravel: Post request keeps getting 302

I am making a post that seems to successfully reach the controller but the browser keeps showing a 302 response. I am logging the request with dd() and am getting the text to log appropriately. I don't know why I am getting a 302 though. I posted my code below and would love some input on what I'm doing wrong. Thanks!

Blade

<form class="form" role="form" method="POST" action="">
    <div class="form-group @hasError('custom_text')">
        <textarea name="custom_text" value="">
        </textarea>
        @error('custom_text')
    </div>
    <button class="btn btn-success" type="submit">Update Custom Text</button>
</form>

Controller

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Http\Requests\Admin\CustomTextFormRequest;

class CustomTextController extends Controller
{
    public function index()
    {
        return view('admin.store.custom-text');
    }

    public function update(CustomTextFormRequest $request)
    {
        $customText = $request->input('custom_text');
        dd($customText);
        flash('Custom Text Updated!');
        return redirect()->back();
    }
}

CustomTextForRequest

class CustomTextFormRequest extends FormRequest
{

    public function authorize()
    {
        return true;
    }


    public function rules()
    {
        return [
            'custom_text' => 'required|string',
        ];
    }
}

** Routes **

Route::post('admin/store/custom-text/update', 'Admin\CustomTextController@update');

via Chebli Mohamed