Have you tried reading (deciphering might be a better word) the info which comes up under “View Site Report” – a lot of these are over-conservative issues which would take several things in conjunction to actually be an issue – for what it’s worth, I’m a bit of a geek and semi-paranoid in nature and I’m not worried – the SSL certificate is in order and the couple of online scans I ran didn’t bring anything notable up.
Sometimes it can be as simple as an out-of-date version of some software being used when the latest version is fractionally more secure in as little as one specific way which can cause a “Possible” issue.
To put it into non-geeky terms, it could be something equivalent to something along the lines of a Tyre pressure sensor not working occasionally – it doesn’t mean you have a flat or shouldn’t drive.
"Man is born in freedom, but he soon becomes a slave, in cages of convention, from the cradle, to the grave."