[web2py] Problem while using two sqlform.grid in a single form

[rahulserver]

I tried to use two sqlform.grid in a web2py form. It does work as intended 
except for the problem that when I try to edit on of the form's row, other 
form's row with same Id also appears to be edited. How should i stop it?
my controller:
def CommitmentBrowse_rep():
    rows=db(db.Commitments.Account==session.id).select()
    commtot=0
    compen=0
    comfull=0
    for row in rows:
        commtot=commtot+int(row.Amount)
        if row.pending:
            compen=compen+int(row.Amount)
        else:
            comfull=comfull+int(row.Amount)
            
    rows=db(db.Transaction_Master.Account==session.id).select()
    netdue=0
    for row in rows:
        netdue=netdue+int(row.Net_Due)
        
    pay=0
    rows=db(db.Payments.Account==session.id).select()
    for row in rows:
        pay=pay+int(row.Amount)
    a=[]
    b=[]
    count=0
    a.append([TH('Due Amount'),TH('Commited Amount'),TH('Commitment 
Fulfilled'),TH('Commitment Pending'),TH('Uncommitted Amount'),TH('Payments 
Received')])
    a.append([netdue,commtot,comfull,compen,pay])
    
COMMITMENTS=SQLFORM.grid(db.Commitments.Account==session.id,user_signature=False)
    
PAYMENTS=SQLFORM.grid(db.Payments.Account==session.id,user_signature=False)
    return dict(COMMITMENTS=COMMITMENTS,PAYMENTS=PAYMENTS,SUMMARY=TABLE(a))