Hi, to be honest, I treat IE browsers that if something doesn’t work that works in all other browsers I won’t even bother investigating because a solution would definitely involve some kind of css/html IE hack.
I believe IE requires xml naspace for both open graph and facebook so try the following, added
xmlns:fb="https://www.facebook.com/2008/fbml"
to the html node attributes
<html xmlns="https://www.w3.org/1999/xhtml" dir="ltr" lang="en-US" xmlns:og="https://opengraphprotocol.org/schema/" xmlns:fb="https://www.facebook.com/2008/fbml">
this will most likely be in the header.php of your current theme – also make sure there are no javascript errors on your pages – pass that, all I can sugget is not to use IE9