Calendar does not display properly

Hello all. I've just installed the CE server for testing so I still have a lot (all) to learn.

I created a few events/calls on the calendar for a specific lead. When I go to the Calendar screen and select Week, I have an empty yet visible grid when there is no event scheduled - which is the proper behavior. But if I try to open a week with scheduled events, I get an empty section (no grid).

When I uncheck "Display time slots in Day and Week views", the events are displayed. However, that's not a format I could work with.

Do you know why I need to do to fix that? I looked at the scripts in Modules/Calendar and suspect that the issue comes from the class CalendarActivity.

Thank you for your help.

Luke