Thunderbolt Calendar and iCal won't sync two ways

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http://forums.androidcentral.com – Deleted occurrences of a repeating event don't sync two ways between iCal and my HTC Thunderbolt android phone calendar using Google Calendar. All other syncing is okay. When I delete a single occurrence of a repeating event in iCal, it will delete on the web in the Google calendar, but the event doesn't delete on my phone. However, it works the other way around; if I delete the event from the phone, it will delete on the web and in iCal. This only happens when deleting a single instance of a repeating event. It does not happen when deleting a single, non-repeating event, or when edit (HowTos)