Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
It seems like those link image do not support https so causing this issue, you can check my attached screenshot below.
By the way, I already help you enabled that Easysocial cache image URL setting from backend, it should work fine now, mean when you share a URL, system will store as a cache image so it will not call that original link image URL.
Can you give it a check?