A previous version of 2.3.2 was broken..
I would recommend you upgrade to Bootstrap 3 and use:
<link href="http://getbootstrap.com/dist/css/bootstrap.css" rel="stylesheet" />
Or you can use Bootstrap CDN:
<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
And the Modal Code