Forbidden when updating certain pages

Hi there,

I’m getting a Forbidden message when I try to update or preview a couple of the pages in my website.
The strange thing is that not all of them are failing. I can still update a number of them.

I’m using WP ROCKET as a cache plugin, but disabling it doesn’t fix the issue.

I don’t see any differences between the pages that work and the ones that don’t.

Does this light a bulb on any of you?

Thanks,
Jesús

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