Lookbook slide stuck to 1 fullwidth image per row on desktops

Hello tea, I used to have the slider on mobile be full width but have 4 images per row.
Now it seems broken and shows one massive fullwidth image.
The fullwidth is good on mobile view of course, but not on desktop view.

Can you help me fix this please? I do have some custom CSS written, but even after removing it all, disabling wprocket cache, it still shows one big image.