Groupwise 8.0.1

We recently upgraded from GW 7 and did not have this problem until the upgrade. We have a shared folder. User A can send a task to the shared folder. Since the upgrade, the task also shows in the user's calendar too. If user B deletes (or declines) the message from within their personal calendar, it also removes the message from the shared folder.

1) Why is the message being sent to user's personal calendar too?
2) When user B deletes the message from their personal calendar, why does it also delete the message from the shared folder?