Events disappear in Calendar view, intermittently

Hi:

Here's the site: http://few.modernmediajapan.com/events/

Events that show up in the Upcoming Events widget on the front page: http://few.modernmediajapan.com/

are only showing up on the Events Calendar page once I click 'Next" then go back to "Previous".

What do I need to set to fix this?

thanks,
Terri