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Collection list layout

Hi all.
Very new to the web flow game but enjoying learning something new.

I created a team layout using the collection list which I thought as working just wonderfully and I had the layout order set to random - the first two random displays worked great but then all of a sudden on desktop and tablet the layout broke like the attached image with the 3rd image being pushed soon to the next line ( there is 6 in the list )

I’d love to know what causes this and what I can do to stop it happening?

Many thanks