At the very bottom of your pages that don't work, you have the following code:
<fb:comments numposts="10" simple="No" width="550" reverse="No" css=" " xid="6"></fb:comments>
<script type="text/javascript">
FB.init(" ", "/plugins/content/xd_receiver.htm");
</script></div> <!-- START of joscomment --><!-- END of joscomment -->
That call to FB.init with a blank first parameter is the problem. Disable whatever module that is, and your problem should be fixed. Is that the FBComments module or something else? We can probably help you fix that too. I just learned more about Brody Ruckus than I ever wanted too (it's a fake marketing scam, by the way, I also learned).
No clue why a blank param sends you to that page, but we'll figure it out.