Here is the HTML.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Title</title>
<link href="css/bootstrap.css" rel="stylesheet" type="text/css">
<link href="css/bootstrap-responsive.css" rel="stylesheet" type="text/css">
<link href="css/style.css" rel="stylesheet" type="text/css">
<!-- HTML5 shim for IE backwards compatibility -->
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<nav class="navbar navbar-inverse">
<div class="navbar-inner"> <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span> </a>
<div class="nav-collapse">
<ul class="nav">
<li class="active"><a href="#">HOME</a> </li>
<li><a href="#">ABOUT</a></li>
<li><a href="#">WORK</a></li>
<li><a href="#">RESUME</a></li>
<li><a href="#">CONTACT</a></li>
</ul>
</div>
</div>
</nav>
</div>
</div>
<div class="container-fluid">
<div class="row-fluid">
<div class="headline">
<header class="span8">
<h1>Headline goes here</h1>
</header>
</div>
</div>
</div>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>
In the CSS, I have nothing about the positioning changed or anything—just colors and spacing and whatnot. I have the .navbar .nav > ul property set to display:box; could that be affecting it?
Let me know if you need more info
Here's the jsfiddle, without bootstrap files: http://jsfiddle.net/6PRhf