I don't need back-end access just yet. There's something strange going on on your server and/or site that you may need your tech support to investigate.
If you go to the below site and enter your address, you'll see that the headers on your site are returning a "Temporarily Moved" return header, which then points to the same page. This is not normal. If you put in the non-www address, you get a "Permanently Moved" and it points to the www version (which is good/correct). I'm not sure this is the cause, but it could easily be something that Facebook/IE is having issues with.
<!-- m --><a class="postlink" href="
www.webconfs.com/http-header-check.php">
www.webconfs.com/http-header-check.php
I don't know where this is coming from, but a quick option to check if it fixes it is to turn off all SEO and then rename your .htaccess file to something else (so it's not used). That's a very common place for header redirects, but it can be done elsewhere.
Again, this may not be the cause, and if you're confident it isn't, let me know and I can investigate further. You'll want to fix this to return a normal status (code 200) no matter what as this will hurt your search ranking.