Calendar events don't appear with correct times
Your events used to display the correct time and now are hours off. Even when you edit the event and update the times, it keeps going back to a different time. This does not affect newly created events, only the old ones.
Partial Fix: this anomaly is the result of switching the site time zone setting since the event was created. The only real fix is to revert the site time zone setting to the previous time zone.