It might be either a cache related problem or there might be a 3rd party script error on the page, preventing the slider script to load – resulting in items in a row.
My mac is currently in a repair shop, so I'm not able to test it unfortunately, but my first suggestions would be to try to change this option, and then clear all cache: https://i.imgur.com/xNRxYoh.png
This change will try to circumvent any script loading problem by using a different variable scope. Let me know!
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