Hi Mohammed
Again, please go to the Notification for the Stage/Path/Sequence Number where the approval step takes place.
If you do not want the user to receive any notification until the entire request has been completed then you need to remove the notification event and add one on the global settings.
Please search SCN for MSMP instance runtime transaction/webdynro. It is a tool you will want to become familiar with to assist you in troubleshooting your MSMP configuration and tracking request issues.
Regards
Colleen