Twitter Bootstrap Icon-bar not Displaying - html

Question

Only 2 of my three icon-bars show when I resize my browser. Previous answers show that people have not put their icon-bars in the right nav tag, however I have done this and it is all correct. My website is viewable here, but here is my code for header.php too:
<nav class="navbar navbar-default" role="navigation">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div id="logo">
<a href="http://http://www.franhaines.co.uk/paddlethewye/"/> <img src="wp-content/themes/BareTheme/logo.png" alt="Paddle the Wye Logo" border="0" /></a>
</div>
</div>

Answer 1

I found this rule on your page:
span {
color: #fff;
display: block;
font-family: centrale_sans_regularregular,helvetica;
font-size: 30px;
position: absolute;
text-align: center;
top: 50%;
width: 100%;
z-index: 80;
}
from bootstrap.
The position absolute is breaking it; override position to be static or unset for span.icon-bar and it'll fix it.

Answer 2

You overide the bootstrap styles with your own stylesheet.
You must remove or specify your code (http://www.franhaines.co.uk/style.css) like so:
span:not(.icon-bar) {
color: #fff;
font-family: centrale_sans_regularregular, helvetica;
font-size: 30px;
z-index: 80;
position: absolute;
display: block;
top: 50%;
text-align: center;
width: 100%;
}

Answer 3

Same Code Works Fine For Me.
<link href = "http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel = "stylesheet">
<nav class="navbar navbar-default" role="navigation">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div id="logo">
<a href="http://http://www.franhaines.co.uk/paddlethewye/"/> <img src="wp-content/themes/BareTheme/logo.png" alt="Paddle the Wye Logo" border="0" /></a>
</div>
</div>
Demo Here
Note: Bootstrap CSS from Here