Random sorting

Good morning,

I wanted a random order for my carousel, but I noticed something odd. I noticed that for some reason, on mobile phones, the carousel is stuck on the same random order for all of my users (instead of having a different order at every connection).

On a computer, it does re-generate the post order every time I refresh the page, but sometimes it gets stuck on the very same random order for all of my users again.

I expected the post order to be different at every connection on the page. Is there something I’m missing?

Thanks so much for your help with this.
Elodie

The page I need help with: [log in to see the link]