W- Checkup Error on SSL

Hiya

When I run WP Checkup on https://webhive.com.au (WordPress multisite) I get this error:

While your site seems to be setup with an HTTPS URL for secure communication, there seem to be some encryption issues that invalidate it.

•http://gmpg.org/xfn/11 => N/A

I passed this on to my support team and they need more details.

Is this really a problem? If so, what’s the problem and how do I fix it?

Thanks

Jackie