Unobtrusive jQuery and AJAX

Hello!
I have this page:

@using System.Web.Mvc.Html
@using System.Web.Optimization
@model Lab5.EPAM.WebUI.Models.RegisterUserViewModel

@{
    ViewBag.Title = "Register";
    Layout = "~/Views/Shared/_Layout.cshtml";
}<h2>Register</h2>


@using (Html.BeginForm("Register", "Account", FormMethod.Post, new { id = "form" }))
{
    @Html.AntiForgeryToken()<div class="form-horizontal"><hr />
        @Html.ValidationSummary(true)<div class="form-group">
            @Html.LabelFor(model => model.UserName, new { @class = "control-label col-md-2" })<div class="col-md-10">
                @Html.EditorFor(model => model.UserName)
                @Html.ValidationMessageFor(model => model.UserName)</div></div><div class="form-group">
            @Html.LabelFor(model => model.Password, new { @class = "control-label col-md-2" })<div class="col-md-10">
                @Html.EditorFor(model => model.Password)
                @Html.ValidationMessageFor(model => model.Password)</div></div><div class="form-group">
            @Html.LabelFor(model => model.Email, new { @class = "control-label col-md-2", width = 100 })<div class="col-md-10">
                @Html.EditorFor(model => model.Email)
                @Html.ValidationMessageFor(model => model.Email)</div></div><div class="form-group">
            @Html.LabelFor(model => model.Male, new { @class = "control-label col-md-2" })<div class="col-md-10">
                @Html.EditorFor(model => model.Male)
                @Html.ValidationMessageFor(model => model.Male)</div></div><div class="form-group"><div class="col-md-offset-2 col-md-10"><input type="submit" value="Register" class="btn btn-default" /></div></div></div>
}<div>
    @Html.ActionLink("Log in", "Login")</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")<script>
        $("#form").on("submit", function (event) {
            event.preventDefault();
            if ($("#form").validate()) {
                $.post("/register", $("#form").serialize(), function () {
                    window.location.href = '@Url.Action("Login")';
                });
            }
        })</script>
}

But when I press button and my fields is empty, I can see for a millisecond Error messages of unobtrusive near fields, but I am redirecting on "Login" page always.
How can I fix it?