ses Workflow posting delayed

Hi,

sap Workflow for Service entry sheet is triggered and the user has approved th workflow by using the decesion task , pressing Approve button the workflow log shows the time stamp as 30/04/2010 approval date

But the actual release fo the service entry sheet is carried out by the background job on 03/05/2010

There is 4 days delay in posting of the Service entry sheet

What could be the reason.

Synchonizing buffer?

I have in SDN but could not find any answer for the above query