Knowledgebase: Google
Editing a recurring instance causes last instance on web client to disappear
Posted by - NA - on 29 June 2009 01:28 PM
When an occurrence of a daily, weekly, or monthly recurring series is edited on the Google web client and the change is saved for "all following" instances, the last occurrence in the series may disappear from the web client display. 
The device, however, correctly shows this last occurrence.  Consequently, the device calendar will not match the server calendar.

This behavior was seen when the editing involved changing the instance's time to later in the day. This seems to be an issue inherent to the Google web client, as it occurs even when there is no device registered to the account.