ASP.net mvc ActionResult parameter

My controller looks like this:

public ActionResult Index(string username)
        {
            if (string.IsNullOrEmpty(username))
            {
                _userId = User.Identity.GetUserId();
            }
            else
            {
                var user = UserService.GetUserByUserName(username);

                if (user != null)
                {
                    _userId = user.Id;
                }
                else
                {
                    return RedirectToAction("Index", "Routines");
                }
            }

            return View();
        }

        [HttpGet]
        public JsonResult GetUserHomeData()
        {
            return Json(CreateHomeViewModel(), JsonRequestBehavior.AllowGet);
        }

        [HttpGet]
        public JsonResult GetUserStatisticsOverview()
        {
            return Json(CreateUserStatisticsOverviewViewModel(), JsonRequestBehavior.AllowGet);
        }

And I have problem with parameter username of ActionResult Index. I've monitored username variable and if I type url like this: www.test.com/profile/someUserName

Variable username is assigned these values: 1. someUserName 2. GetUserHomeData 3. GetUserStatisticsOverview

I call these Get methods from my javaScript file, why is this happening and how can I prevent this, i.e. catch only "someUsername"

EDIT

Here is my route config:

    routes.MapRoute("Profile", "profile/{userName}",
                    new { controller = "Profile", action = "Index", userName = UrlParameter.Optional }
                    );

routes.MapRoute("Default", "{controller}/{action}/{id}",
                new {controller = "Home", action = "Index", id = UrlParameter.Optional}

                );

EDIT 2

Here is how I access Get methods (I'm using Angular's $http)

getResult: function() {

            var input = $http.get("/Profile/GetUserHomeData");

            var deferred = $q.defer();

            deferred.resolve(input);

            return deferred.promise;
        }