How to get small square images on front page?

I recently switched to Catch Responsive Pro on both my websites. On http://helensjoholm.nu/ everything looks exactly the way I want it. But even though I have entered identical settings on http://andersekborg.nu/ the post images don´t look the same at the bottom of the front page! The featured images have the same dimensions; 860 x 484 px, which you recommend for featured images in posts. On helensjoholm.nu they appear as small square images on the front page. But on andersekborg.nu they appear as small rectangular images. How can I make them look the same? I would like to have the small square images (as it looks on helensjoholm.nu) in the bottom posts on both my websites. I can´t find any diffetrence in settings or image size between the sites.