What have I done so far:
Implemented Magnific Popup library and Webflow collections to work together. There are maximum 25 fields for images in a blog post collection. (Webflow allows 30 fields per collection). If there are less images, the empty fields are filtered.
Found the solution. Applied object-fit: cover to the image class and it worked!
The object-fit custom css is a great solution with a 90+ % coverage for users (browsers). Just remember that you are loading lots of extra pixels if you don’t format first. Glad you resolved your issue. Happy webflowing!