Events+s plugin page issue

Hello there,
Until recently we have had an old licensed plugin that was under a different name if i remember correctly. It stopped working, so we paid for the license again and installed the new version of the Events+ plugin. Unfortunately, we still have issues because our old event pages do not show content:
http://huntingtonhistoricalsociety.org/hhs-events/2017/10/saturday-october-7-how-to-find-church-and-religious-records-for-your-ancestors/ If we create new events, these show up well: http://huntingtonhistoricalsociety.org/hhs-events/2017/10/test-event/ What can we do do solve this problem?

Thank you.