Http and Https

Hello, great little plugin but I seem to have an issue whether http or https is used when copying the address to Facebook? For example copying the following to a post shows the default logo image..

https://www.interiordesign.market/brand/velux-group/

However using http shows their logo..

http://interiordesign.market/brand/velux

The website is updated to https in general settings etc and runs a ssl plugin.

Any information greatly appreciated!