Graham F. couple different issues here - one is you'll want to have a grid wrapper - it looks like this class was removed completely. You'll need this on the collection list element.
Second - it looks like the collection "layout" was modified but should be left at default which is full width.
Oh and you have a border on the card-row38_card-content div which was not there in the default component.
Then for each breakpoint, you can adjust the number of grid columns based on the number of items and the screen size.