Imbalance 2 – Related posts section not showing what it should

Hello,

I am using the theme Imbalance 2 by WPShower – https://wpshower.com/themes/imbalance-2/

This is the website I am building: https://109.123.92.192/~ariellag/

I have the “related posts” option enabled, but it has recently stopped working as it should. Below a the main body of a post it used to display a grid of thumbnails for posts in the same category. Used to work fine. But now, for some reason, it only displays the most recent posts, ignoring category.

I can;t think of anything i might have done that could have caused this.
I’ve deactivated plugins added but doesn’t make any difference.

Any idea what might have caused this change? And any idea how to fix it?!?

Thanks a lot for your help,

Adam.