There's something on your site that's stripping our tags. Unfortunately, I don't know what that is. We've heard that the RokZipper plugin can cause issues like that, but it could be anything on your site. It's not something from our extension. We don't change the output based on the browser. Something that is changing it per browser though (usually to optimize things) is.
Please keep investigating and let us know if you can't get it, but there's not much I can recommend. Obviously, there's something with your template, but we can't fix that (you may need to contact RocketTheme).
Alex