Hello Rakshita
I'm not sure if the issue is resolved at your end but going through the conversation it seems you have added two activities but the CloseOn is not maintained correctly.
For the CloseOn you need to configure it with the UserID (ApprovedBy) or find a way to make this data unique for each approver. If there will be simple CloseOn (for entity update) the processes will be closed by updating an activity.
Feel free to share more details on it, if the issue if persistent