Featured Image not sizing properly

Hello
For some reason I can’t get the featured image to constrain to a particular ratio.
I’ve set it as a custom size of 600x400px so it would keep a 3:2 aspect, I need all the images to be the same height. This worked fine in my dev site, see the page here

https://sandbox.echo-mr.com/entertainment/

But for some reason when I migrated the site and went live with it it stopped working, no matter what custom dimension I put in the loop it has no effect and it’s throwing off the layout. Any idea why?
Here’s how it look on the live site

https://univisionistas.com/entertainment/

The page I need help with: [log in to see the link]