The blog has a very peculiar way of handling the listings of pages. It creates invalid URLs and hide them to humans but they are still visible to crawlers.
These links are not displayed on the page but they are picked up by link checkers. This is a big pain because when you are running a site audit to fix broken links, you have to review a lot of broken links that cannot be fixed. I am also concerned about the way Google looks at this. I suspect Google will treat these links as broken links.
It's just poor engineering to create invalid links and hide them rather than properly handling boundary conditions. Please fixe this soon. Thanks.