viewing the HTML source of your page on the wrapped forum I see the SMF headers twice. Once is in the correct JSMF headers which the bridge stripped from the template and inserted in the page head tags(where it should be) and the other is halfway down the page when the SMF output starts. This is most likely why it isn't working.
The bridge is designed to strip your SMF head and duplicate html tags out before displaying the forum. This allows for XHTML validation without the need to modify your SMF template whatsoever when you install the bridge. So the stripping out of the SMF head and duplicate html tags is failing.
Checking your standalone I see your body tag has <body id="page_bg" class="w-wide f-default"> This is why the stripping is failing. I am going to update the bridge to handle these additional options(id and class and whatever else) however that means they will get stripped and your CSS definitions won't be applied. My suggestion is to add a div to replace the id and class you are applying to the body. For example, right now you template has:
<body id="page_bg" class="w-wide f-default">
I would change this to:
<body><div id="page_bg" class="w-wide f-default">
If you do that make sure to close the div at the bottom, find the tag
</body>
and replace it with
</div></body>
does that make sense?