Mismatch of Times

Hi, what version are you running?
Did you check for plugin theme conflicts? https://time.ly/document/user-guide/troubleshooting/first-troubleshooting-step/
Do you import events from ics?

Plugin version 2.2.0

There shouldn’t be any theme conflicts because it’s a custom theme that has been working with AI1EC for over a year without issue.

There may have been events imported when we built the site initially, but these were entered manually.

Have you set a time zone in your calendar settings? Also, when you create a new event you should ensure the same time zone is selected on the “add new event” page.