sum function and problem in left outer join in report builder

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SQL-Server

SQL-Server-2008

SSRS

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Hi.Please help me.

My query in report builder is:

SELECT  b.MembershipId,b.Amount ,
        t.Amount AS tamount ,
        t.IncomeItemId ,
        p.Amount AS pamount
FROM    Finance.Bill b
        INNER JOIN Finance.MembershipTransaction t ON t.BillId = b.id
        LEFT OUTER  JOIN Finance.Payment p ON p.MembershipId = b.MembershipId
WHERE   b.MembershipId = 53672 AND p.CauseId IN (2,3)

where I execute this,Result is:

MembershipId  |	BilAmount |	Transactionamount |	IncomeItemId |	Payment
53672	3450000.00	2000000.00	24	2250000.00
53672	3450000.00	320000.00	28	2250000.00
53672	3450000.00	1130000.00	30	2250000.00
53672	1400000.00	1400000.00	35	0.00
53672	3450000.00	2000000.00	24	2600000.00
53672	3450000.00	320000.00	28	2600000.00
53672	3450000.00	1130000.00	30	2600000.00
53672	1400000.00	1400000.00	35	2600000.00
53672	1400000.00	1400000.00	35	2250000.00
53672	3450000.00	2000000.00	24	0.00
53672	3450000.00	320000.00	28	0.00
53672	3450000.00	1130000.00	30	0.00
53672	3450000.00	2000000.00	24	0.00
53672	3450000.00	320000.00	28	0.00
53672	3450000.00	1130000.00	30	0.00
53672	1400000.00	1400000.00	35	0.00

I am using this query in report builder.
I use Row group,but when i run my report ,result is incorrect when using sum function.
What this happen.what i do??