What my friends here are trying to say, is that it looks like you've got yourself a CSS issue there.
You code follows the default ASP.Net MVC Razor code - just make sure that 1) This code exists within the
*Body* element, and 2) that all required CSS files can be found by your application.
Default ASP.Net MVC app source:
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">Application name</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="/">Home</a></li>
<li><a href="/Home/About">About</a></li>
<li><a href="/Home/Contact">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="/Account/Register" id="registerLink">Register</a></li>
<li><a href="/Account/Login" id="loginLink">Log in</a></li>
</ul>
</div>
</div>
</div>
<div class="container body-content">
...
</Body>
*(Edited to include Body Tag, which CP deleted from my original submission - probably to prevent html issues.)*