Ok, so it should be explained that the random sorting will only work at every publishing. And it is not. I’ve sent this bug report through the dashboard and received no answer.
Not even this kind of explanation.
So I’m not sure if it is really a feature to change the random sort only at every publish…
Moreover, there is a post on this forum where the webflow team itself shares a script to do this exact same thing. And later in the post, they share the random sorting feature to be live, so I guess this should have been the same thing…
Anyway, the site hasn’t changed since the last 24 hours, so I guess it is not a matter of cache.