jquery - Bootstrap divs narrowing after jQuery .load()

Question

I have a bit of a pickle here. Whenever I update the contents of my page the first time with a jquery .load() the new divs that are created are smaller in width, and there ends up being empty space on the right side of the page. Subsequent refreshes keep the same width, it's just the first one that messes it up. I've tried a few different things with css and messing with the layout, but I'm out of ideas. Here's my html:

<div class="wrapper"> 
  <div class="navbar"> ... </div>
  <div class="container-fluid">
  <div class="row-fluid">
    <div class="span2">...</div>
    <div id="product_window" class="span10">
      <div class="row-fluid">
        <div class="span4">...</div>
        <div class="span4">...</div>
        <div class="span4">...</div>
      </div><!-- end inner-row -->
    </div><!-- end span10 -->
  </div><!-- end row -->
</div><!-- end container -->