Locks on my buttons

[limdc]

I have a calendar linked to assignments on my Math course.  A few days ago, a student brought to my attention that all the numbers and buttons on the calendar show up as locks on her Student View.  When I checked my Student View, I saw several random locks, but not on all of the numbers or buttons.  On my new calendar for September it is the same, although I have nothing linked to those numbers yet.  I have calendars in all my other courses and Math is the only one giving me problems.