That's one of the posts with the issue, right?
You are not using the image's direct URL (ending with .png/.jpg). You are basically embedding Imgur's page.
You are using: https://imgur.com/gItg19p
But you need to right click the image and select "Copy URL of the image", which will give this: https://i.imgur.com/gItg19p.jpg
Part that, part for some reason imgur stopped using https: in the links they provide as hosseinimr93 posted above.
Apparently at some point in time the addon that I was using that converted all links in my posts to https: stopped working and I never noticed. So I was posting http for a long time now.
Thanks for the help.
Stay safe.
-Dave