Only one Row but keeps adding columns

Hi, We are using Post Grid Combo to display news stories on a specific site, but instead of only showing 2 columns as put in the settings, it just keeps inserting more and more post as we go and only keeps it in a single row!

We would like to only have 2 or maybe 3 columns and then just multiple rows.
ANother thing is, that it is now at all centeret on the page?

This is the website in question -News - AI for Defence (ai4def.com)