Can't click on calendar events

Can't get into event info on random calendar events. Seems to happen on about 10-15% of events so not all but enough to be annoying.

Single clicking on the event will highlight the event. Can also drag the event from day to day and expand to multiple days. Double clicking won't open event info. Instead it just adds a new event. Right clicking won't open the event options menu, just comes up with "new event" and "paste event", as if you're just right clicking on empty space.

Closing and reopening the app doesn't seem to make a difference. Sometimes it'll start working again one one event but stop working on another.