That is working as intended, the alias is just other URL that your content goes by. To reference the alias instead of the original URL, you'd have to change your structure to do it so.

Normally, you'd create the umbracoUrlAlias on the SEO document type, so all pages would have it. If you do that, you can easily get that property on your content and use it instead.

Example:

    if(Model.Content.HasValue("umbracoUrlAlias"))
    {
         var Link = HttpContext.Current.Request.Url.Host + "/" + Model.Content.GetProperty("umbracoUrlAlias").Value.ToString();
         <a href="@Link">Link</a>
    }
    else
    {
         <a href="@Model.Content.Url">Link</a>
    }

I created a new codebehind file to accommodate this. FixAliases.cs in App_Code folder. Site uses older webforms templates:

using System;
using System.Collections.Generic;
using System.Linq;
using Umbraco.Core;
using Umbraco.Web;
using Umbraco.Web.Routing;
using TheOutfield.Routing;
using Umbraco.Core;
using Umbraco.Web.Routing;

namespace TheOutfield.Routing
{
public class UrlAliasProvider : IUrlProvider
{
    public string GetUrl(UmbracoContext umbracoContext, int id, Uri current, UrlProviderMode mode)
    {
        var node = umbracoContext.ContentCache.GetById(id);
        return node.HasValue("umbracoUrlAlias")
            ? "/" + node.GetPropertyValue<string>("umbracoUrlAlias") + "/"
            : null;
    }

    public IEnumerable<string> GetOtherUrls(UmbracoContext umbracoContext, int id, Uri current)
    {
        return Enumerable.Empty<string>();
    }
  }
}

namespace TheOutfield
{
public class Bootstrapper : IApplicationEventHandler
{
    public void OnApplicationInitialized(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    { }

    public void OnApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        UrlProviderResolver.Current.InsertTypeBefore<DefaultUrlProvider, UrlAliasProvider>();
    }

    public void OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    { }
  }
}

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