Mixed HTTP / HTTPS Content

Hello,

My site, when viewed in HTTPS has mixed HTTP and HTTPS content.

If I look at the source I see:

http://gmpg.org/xfn/11
http://s3-eu-west-1.amazonaws.com
http://schema.org/WebPage
http://schema.org/ImageObject

I was expecting that these http URL’s would be changed to HTTPS, but that isn’t the case

Any idea what we can do?

PS: the WP configuration refers to HTTPS in Offload S3 Lite - Same happens when using Cloudfront - In OffLOad S3 Lite I am forcing to use HTTPS

Thanks
Thomas