Its the latest release of both WP and Pro. I am using your child-theme. I do not use CDN. I have cleared my browser cache. About CSS/Jacascript.
I know it has nothing to do with CSS nor JS. If you look at the website you can see that some posts have date rendered, where some do not render.
Changing to a new publish day can make the date render, but the site is built around publishing.
I cannot simply remove stuff to isolate the problem. The website is in producion. This has to be related something else.