Notifications Missing from Worklist

Hi,

Whenever an approver approves or rejects a transaction, the notification about the approval/rejection is visible in the requester's Worklist only for some time(say 1 minute) post which it is disappearing from the worklist even though it is still present in his full list. But this is not happening for those notifications where the approver asks for more information about the request(request for More information).These notifications are present in his worklist all the time.

Please let us know if we need to change any settings so that those approved/rejected notifications are present in the 'Worklist' of the requester for more time.