How to correctly use Remote Validation attribute in ASP.Net MVC 5

Ok, I am a beginner and working on an ALREADY EXISTING ASP.Net MVC 5 web app.

Overview of WebApp: This web app is more like work press and dynamically creates different sort of widgets and functionalities as per the client demand. So multiple URL's hits this web app and they all are treated as a separate web site. All the widgets have their own url's. these Url's are linked into different clients and all that fun stuff.(HUMOR me on this).

Issue: Issue might be totally unrelated to what I explained above. How to correctly use Remote Validation attribute in ASP.Net MVC 5. Below is code snippet and issue. I just have one Email Id field and I want to apply Remote validation to it.

Model

public class ForgotPasswordMV
{
    [Display(Name = "Email"), Required]
    [Remote("IsEmailUnique", "Settings", ErrorMessage = "Somethin Wrong")]
    public string EmailId { get; set; }
}

Controller Function

Public JsonResult IsEmailUnique(string EmailId)
{
    var respObj = SecurityHelper.EmailCount(EmailId); // if count > 1 returns false
    return Json(respObj, JsonRequestBehavior.AllowGet);
}

View File

<script src="~/Scripts/jquery.validate.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.js"></script>
<h2>Forgot Password</h2>

@using (@Html.BeginForm("ForgotPassword", "Security"))
{
    @Html.ValidationSummary(true, "Please fix below error")
    @Html.AntiForgeryToken()
    <div class="form-group">
        @Html.LabelFor(m => m.EmailId)
        @Html.TextBoxFor(m => m.EmailId, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.EmailId)
    </div>
    <button class="btn btn-primary">Continue</button>
}

So, for the FIRST TIME when user enters email id and if return type is false then ErrorMessage = "Somethin Wrong" gets displayed properly. But the problem starts from second time. Now everytime I type the letters in the email field to change it. On every keyboard click the IsEmailUnique function starts getting hit. I mean when I see the ERROR MESSAGE for the FIRST TIME after seeing the error message I now went to the UI text box and started giving some other email id but now for every letter I put the remote validation method is getting hit. Ideally it should happen when I am tap out of the text box or click on the sbumit button (the way it worked for the first time)

EDIT

INSPECT ELEMENT CODE FOR THE UI TEXTBOX

    <div class="form-group">
     <label for="EmailId">Email</label>
     <input class="form-control input-validation-error" data-val="true" data-val-remote="Something went wrong" data-val-remote-additionalfields="*.EmailId" data-val-remote-url="/Settings/IsEmailUnique" data-val-required="The Email field is required." id="EmailId" name="EmailId" type="text" value="" aria-required="true" aria-invalid="true" aria-describedby="EmailId-error">

<span class="field-validation-error" data-valmsg-for="EmailId" data-valmsg-replace="true"><span id="EmailId-error" class="">Something went wrong</span></span>
</div>

Further More During second attempt (after successfully seeing Remote validation error) when I try adding any letter in Email ID Field I am noticing that below chunk of code gets hit and then the validation method IsEmailUnique is getting hit.

   public class SimRoute : Route
    {
        /// <summary>
        /// Base c-tor, implementing the base class ctor
        /// </summary>
        public SimRoute(string url, IRouteHandler routeHandler) : base(url, routeHandler) { }

        /// <summary>
        /// This is where the "magic" happens - this is where the subdomain is retrieved & inserted into route values, so it can be referenced at a later time
        /// 
        /// The rest of the functionality is being retained by running the call to the base class
        /// </summary>
        public override RouteData GetRouteData(HttpContextBase httpContext)
        {
            RouteData routeData = base.GetRouteData(httpContext);

            if (routeData != null)
            {
                string[] temp = httpContext.Request.Url.Host.Split('.');

                if (temp.Length > 0)
                {
                    routeData.Values.Add("subdomain", temp.First());
                }
            }

            return routeData;
        }
    }

CALL STACK

To be honest, I am not sure what this above code snippet does, but why this code is getting hit as soon as I type any letter in the EmailID text box, or this code is even remotely related to the issue. My original question is, why Remote validation is happening on every letter put in textbox. I have tried to put as many details as I can in the question. Please guide me.