Problem with rights

When a user posts a message on the timeline any other user can delete this message. I checked the rights and nothing strange there. Any Tips?

ADD: I can enter /studio as a user or moderator with full rights. (not good)
ADD: Site break down!! We think it is a cause of the many changes in the navigation menu in 'Studio>Navigation'
(We had set up a nice website with all the options from 'studio' settings. Perfect on desktop and easy on mobile.)
ADD: Fresh start, new install of UNA 10 RC1 BETA