Rails deviseでアカウント情報を更新するとactiveadminの閲覧画面の内容が全て同じになる

activeadminの管理画面でUserの一覧画面（index）から閲覧（show）をクリックするとどのユーザの閲覧もユーザid2の情報が表示されてしまいます。
現象はアカウント情報を変更すると起きます。
例:　Twitter認証後にメールアドレス、ユーザネーム、パスワードを一度に変更した時に現象が起きます。

ログ

Started GET "/admin/users/1" for 127.0.0.1 at 2015-06-11 02:33:01 +0900
Processing by Admin::UsersController#show as HTML
  Parameters: {"id"=>"1"}
  User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."deleted_at" IS NULL AND "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 2]]
  AdminUser Load (0.2ms)  SELECT  "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = ?  ORDER BY "admin_users"."id" ASC LIMIT 1  [["id", 1]]
   (0.1ms)  SELECT COUNT(*) FROM "active_admin_comments" WHERE "active_admin_comments"."resource_type" = ? AND "active_admin_comments"."resource_id" = ? AND "active_admin_comments"."namespace" = ?  [["resource_type", "User"], ["resource_id", "2"], ["namespace", "admin"]]
  CACHE (0.0ms)  SELECT COUNT(*) FROM "active_admin_comments" WHERE "active_admin_comments"."resource_type" = ? AND "active_admin_comments"."resource_id" = ? AND "active_admin_comments"."namespace" = ?  [["resource_type", "User"], ["resource_id", "2"], ["namespace", "admin"]]
  Rendered /Users/mai/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/active_admin-cef68b7be826/app/views/active_admin/resource/show.html.arb (408.3ms)

コントローラー

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController

  def facebook
    callback_from :facebook
  end

  def twitter
    callback_from :twitter
  end

  private

  def callback_from(provider)
    provider = provider.to_s

    @user = User.find_for_oauth(request.env['omniauth.auth'])
    @user.skip_confirmation!
    if @user.persisted?
      flash[:notice] = I18n.t('devise.omniauth_callbacks.success', kind: provider.capitalize)
      sign_in_and_redirect @user, event: :authentication
    else
      if provider == 'twitter'
        session["devise.twitter_data"] = request.env["omniauth.auth"].except("extra")
      else
        session["devise.facebook_data"] = request.env["omniauth.auth"]
      end
      redirect_to new_user_registration_url
    end
  end




class Users::RegistrationsController < Devise::RegistrationsController


  protected

  # 現在のパスワードを入力せずにアカウント情報を変更
  def update_resource(resource, params)
    resource.update_without_current_password(params)
  end

モデル

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable, :confirmable,
  :recoverable, :rememberable, :trackable, :validatable, :omniauthable, :authentication_keys => [:login]

  attr_accessor :login

  # 現在のパスワードを入力せずにアカウント情報を変更
  def update_without_current_password(params, *options)
    params.delete(:current_password)

    if params[:password].blank? && params[:password_confirmation].blank?
      params.delete(:password)
      params.delete(:password_confirmation)
    end

    result = update_attributes(params, *options)
    clean_up_passwords
    result
  end

  def self.find_for_oauth(auth)
    user = User.where(uid: auth.uid, provider: auth.provider).first
    unless user
      user = User.create(
          uid:      auth.uid,
          name:  auth.info.name,
          user_name:  User.dummy_user_name(auth),
          provider: auth.provider,
          email:    User.dummy_email(auth),
          password: Devise.friendly_token[0, 20]
      )
    end
    user
  end

  private

  def self.dummy_email(auth)
    if auth.info.email.blank?
      "#{auth.uid}-#{auth.provider}@example.com"
    else
      auth.info.email
    end
  end


  def self.dummy_user_name(auth)
    if auth.info.user_name.blank?
      "#{Random.rand(1..9999)}#{auth.provider}#{auth.uid}"
    else
      auth.info.nickname
    end
  end


  # Deviseでメールアドレス以外のカラムをログイン認証に利用
  def self.find_for_database_authentication(warden_conditions)
    conditions = warden_conditions.dup
    if login = conditions.delete(:login)
      where(conditions.to_h).where(["lower(user_name) = :value OR lower(email) = :value", { :value => login.downcase }]).first
    else
      where(conditions.to_h).first
    end
  end


  validates :user_name,
         :uniqueness => {
             :case_sensitive => false
         },
         :format => { with: /\A[a-z0-9]+\z/i },
         :length => { maximum: 40 }




  def self.current_user=(user)
    Thread.current[:current_user] = user
  end
end

routes.rb

devise_for :admin_users, ActiveAdmin::Devise.config

  ActiveAdmin.routes(self)

  #devise_for :users, param: :id_name, :controllers => {:omniauth_callbacks => "users/omniauth_callbacks"}

  # devise_for :users, controllers: { omniauth_callbacks: 'users/omniauth_callbacks' }

  devise_for :users, :controllers => {
                       :omniauth_callbacks => 'users/omniauth_callbacks',
                       :registrations => 'users/registrations',
                       :sessions => 'users/sessions'
                   }