WordPress articles embedded not showing

Good morning;

I have been suffering this issue since I have memory and I thought that it was something common in WP.
When I embed an article of my own website in another article/page, initially in the editor it shows the article well embedded (Square with picture, brief description, number of comments and author)
But, as soon as I publish it and reload the page, it isn’t shown anymore. Well, at least in most of the cases. It is a strange behaviour as maybe re-loading the page several times, in one of them you may be able to visualise it, but as soon as you reload the page again it doesn’t show anymore.

I tried to fix it, but as it wasn’t a function that I used to use with frequency, I just ignored it. However, I have made a compilation page where I must embed other articles. In this way, I must fix this problem.

I have tried changing the theme, deactivating other plugins, and it doesn’t fix. Another thing to know is that the figure captions didn’t work, and I fixed them using a custom CSS. Maybe, could I use another solution like this for the embedded things?

The article where the embedded things are shown is written in the “website” part

The page I need help with: [log in to see the link]