On WP-Theme some categories work, others don't

Hi all,

on my site wie-gross.com something is messed up.When clicking on the Categories the left column some work fine, like :
https://wie-gross.com/category/lander-und-orte/

others don’t load proper and show somehow a broken theme (if it can be called like that)

https://wie-gross.com/category/tabellen-einheiten/

As I am not that wp-geek, I have no explanation for that and certainly don’t know what to do. Each advice would be appreciated.

cheers
Rhoody

PS: even the site is german, I assume you guys can see the problem