fix current page

app/controllers/application_controller.rb

 class ApplicationController < ActionController::Base
+  before_action :store_current_location, unless: :devise_controller?
   protect_from_forgery with: :exception
+
+  private
+
+  def store_current_location
+    store_location_for(:user, request.url)
+  end
+
+  def after_sign_out_path_for(resource)
+    request.referrer || root_path
+  end
 end