PreNav (Bootstrap3) won't drop down in mobile view - html

Question

I can't figure out exactly why my preNav won't drop down in mobile view. I think it might have something to do with the bootstrap.css, but I was hoping someone had some more insight on the issue. I currently have 2 'navbar navbar-fixed-top' horizontal navs on the top of my page. In mobile view, it looks like this:
and the 2nd nav (in white) drops down just fine, but clicking the top nav drop down (in black) has no reaction. Is this due to bootstrap.css? Any ideas would be helpful.Here is my CSS for each nav if it helps:
#nav1 {
position: relative;
top:0;
}
#nav2 {
position: relative;
border-bottom:none;
}
and HTML for topNav (Nav1):
<div class="container-full">
<div class="row">
<div class="navbar navbar-inverse navbar-fixed-top" id="nav1" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="col-sm-3 col-sm-3 pull-left">
<form class="navbar-form" role="search">
<div class="input-group">
<input type="text" class="form-control" placeholder="Search" name="srch-term" id="srch-term">
<div class="input-group-btn">
<button class="btn btn-default" type="submit">GO</button>
</div>
</div>
</form>
</div>
<div class="collapse navbar-collapse navbar-collapse" id="pre-nav">
<ul class="nav navbar-nav" id="pre-nav-menu">
<li>Current Students</li>
<li>Staff</li>
<li>Employers</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<span id="phone">1.877.655.7676</span>
<input type="button" value="Request Info" class="btn btn-default pull-right" id="rinfoBtn" data-toggle="collapse" data-target=".navbar-collapse"/>
</ul>
</div>
</div>

Answer 1

It was indeed my data-target as vanburen pointed out. Instead of data-target=".navbar-ex1-collapse" I needed data-target=".navbar-collapse" , removing the 'ex1-' which must have been left in there as "example 1" from the original megaMenu source I pulled. Thanks vanburen!