Hi,
The bar category does indeed use custom content, in that most of the articles for it are drawn in from other categories. My apologies.
Here is a more straightforward example. ..index.php/diary shows one article 'Diary'. It was last modified some days ago, but is showing today's date as the 'Last modified date', at the top of the page.
This problem is exactly the same as was reported back in 2017 when we first started using this template on my friend's site. JoomlArt fixed it then. So I wonder why it has recurred when I updated the template to version 1.1.8. Even if you fix it now, will the same problem occur if I were to update it to 1.1.9?
I will be away all day today, 9th June, and unable to access the web. I will have to try to find out what FTP details you need when I return.