See this blog page:
There is no featured image visible, but all the rest have it:
None of the posts have featured images set:
(view large version)
You can find out more here and how you can add featured image to your blog posts.
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Also forgot to mention that the Show featured image option is not selected:
Sorry to say but not true. This one has the featured image set:
It is visible here:
at the very top.
I know "Show featured image option is not selected" since then it blast the image at 100 % width at the single post page and under that there is the same small version that I have now at working single blog pages:
So thise ones are the only odd ones that do not work:
They both have the featured image..
The first time I checked your posts the images were not showing, when I checked it again they were showing and maybe it was a matter of time they load, as you can also see in my previous reply I have included a screenshot and that is from your site.
Anyway, please follow the instructions in my second reply as that will show the post image.
In the first mentioned post you have added the image using WPBakery Page Builder code, while the others can't show an image if you have not ticked the option Show featured image.
Ah, I see! How can I copy / reuse the wp-bakery layout?
I found out a video which explains how you can copy/paste the layout to another page: