C# 为什么我有2个ASPXAUTH cookie而不是1个？

我正在创建一个asp.net应用程序，它现在已经可以运行了，但问题是当我使用“Live HTTP Header”时，我发现我的站点有2个ASPXAUTH cookie，正在使用的是底部的一个

在这里，我用屏幕截图展示我的发现：

顺便说一句，以下是我在登录页面中的一些代码：

  string email = tbEmail.Text;
                string pass = tbPass.Text;
                bool remember = cbRemember.Checked;

                var res = (from user in ctx.users
                          where user.password == ctx.ConvertPassword(pass) 
                                                 && user.email == email
                          select user).FirstOrDefault();  // Remark : 0 = active, 1 = Inactive, 2 = Suspend, 3 = Unconfirmed

                if (res != null && res.email.ToLower() == email.ToLower())
                {
                    if (res.userstatus == 0 || res.userstatus == 3)
                    {
                        FormsAuthentication.SetAuthCookie(email, remember);
                        FormsAuthentication.RedirectFromLoginPage(email, remember);
                        var arr =  Request.Cookies.AllKeys;
                    }
                    else if (res.userstatus == (int)UserStatus.Inactive)
                    {
                        lblMessage.Text = "You have deleted your account, if you wish to restore it, please click ";
                        btRecover.Visible = true;
                    }
                    else if (res.userstatus == (int)UserStatus.Suspended)
                    {
                        lblMessage.Text = "Your account has been suspended, for more information, please contact our support";
                    }
                    else
                    {
                        lblMessage.Text = "Invalid username or password";
                    }
                }
                else
                {
                    lblMessage.Text = "Invalid username or password";
                }

我做错了什么

FormsAuthentication.SetAuthCookie(email, remember);

设置cookie。但也有

FormsAuthentication.RedirectFromLoginPage(email, remember);

这是一个更高级别的facade-不仅设置cookie，还将从登录页面重定向到重定向页面