RedirectToAction not working in ASP.NET MVC 5

In my ASP.NET MVC 5 project, I have an ActionResult XXX and an ActionResult YYY. XXX redirects to Action YYY.

public ActionResult XXX()
{
     //Some Code
     return RedirectToAction("YYY");
} 

public ActionResult YYY()
{
     return View();
} 

The ActionResult XXX is called from my HTML form.

<form 
action="~/Home/XXX" method="post" enctype="multipart/form-data"...
</form>

The control reaches ActionResult YYY but the corresponding View doesn't get rendered. YYY works perfectly when called from other ActionResults.

Am I missing something here?