announcements - ordering by publication period
See screenshots. Third announcement is with a short publication period I should expect that ordering on 'show today', 'show this week', 'show this month' would make a difference and would order announcements on the periode users will see them, not on creation-date (which seems now).
Eg. in calendar-view: all announcements I created today are on the date of today, while I would expect the future announcement on the first date it will be visible for course users.