Could be the cache on your mac as well. Clear your cache, reboot your home router and Mac, that should clear the error if you've a valid SSL cert. As others have said, you may have visited your site before the SSL was active, and somewhere along the way, your home network and mac have cached the site address without the cert. I get that sometimes here when i'm impatient. What you can also do is try accessing your site on either a different browser, and/or use a VPN as that sometimes clears the error.