When the parent element to the image has a height or width set to auto, then the images will resize according to their own aspect ratio resulting in different height images and appear uneven.
Currently the image class in that 4th grid is set to contain, so that will show the image at it’s own aspect ratio.
If you change the image class to Cover, there still will be no “cover” of the parent element because the parent element is not constrained, it has an auto height and width.
If you change the parent element though to have some constraint which makes the parent element a different aspect ration than the image, then the Fill:Cover will make the image behave like a background image in that respect and cover the whole parent element area with no white space.
Let me know if you have a question on that, here is an article on how that object fit is used to “squeeze” images in to areas that do not have same height and width: Object-fit support | Webflow Features
You can also set the parent element to 100% height and width and set the image class to Fill:cover to have the image fill the lb link with all images be the same size:
I hope this helps