On my website www.friesjournaal.nl I hundreds of articles that are published in blog-form with 18 articles per page.

I expect when I click on a page-number in the pagination that the articles of that page are shown.

The actual result is that after clicking on some pages (for example 2, 4, 6, 8 ) the selected page is 1, 3, 5 and 7. I looks like when clickin on page 2, the blog starts with article number 13 instead of 19 (because I have an 18 articles blogpage)

The problem has been there for some Joomla-versions now (I hoped that it would solve with some version, but that is not the case). I use the most recent Joomla-versie now (3.9.12)