project arrows - doesn't work in some project pages

[moND0711]

Got a thumbnail grid for my projects on the start page. When I click on a project tile, the single project page opens.
There are project arrows on the left and the right to slide to the next / previous project.

Problem: The project arrows doesn't work on some of my project pages. Got two project pages where the project arrows link to the project page itself and not to the next project as it should be. How can I fix the links of project arrows? Have not a clue how to fix.

Any help?

Thank a lot in advance!

[mariusjopen]

Dear @moND0711
Can you post a link to our website?
Then we can have a look and inspect that.

Marius

[moND0711]

Hi Marius,
sorry for late reply. Here's the link to the website: https://wirschliessendenkreis.de
Thanks a lot in advance!
Marc

[mariusjopen]

Dear@

do you use different categories?

Best!

Marius