HI Sai Krishna,
Just correct me if I am wrong.. your Shopping cart has some n-line items.. As per my guess it may having 3 approval levels. At first level may have 3 approvers(buyer level) and second level may having 2 approvers(manager level) and last one is system as approver( which is an automatic approval)..
If the above given brief description is true. Once the first two level approved completely the third one will automatically approved. so no need to worry..
This is just becuase of configuration..
Regards,
SRM Sankarbabu