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COLLECTION items are different width when clicking on 'next' or previous

I’m having troubles on a gallery I’ve made with collection items.
It changes width (randomly) when going to the ‘next’ 24 items.

See this loom video I’ve made

You can find the page in the designer here:

This is the published page (english version)


When clicked on next button:

Clicking next again made it correct again:

After that it went smaller again.

And then this always happens on the last page: