SQL Sum double counting - sql

Question

My SQL is double counting 'Fund1Amount' and 'Fund2Amount' and 'TotalAllDonations' I have a record where the values of the FundAmount1 should = 10 and FundAmount2 should = 20 but they equal 20 & 40 and the total is double. I am using INNER JOINs twice on the same table abc_donationdetail which i am not sure if this is the problem.
SELECT
C.FirstName, C.LastName,
SUM(D.abc_totalamount) AS TotalAllDonations,
SUM(CASE WHEN DBU.abc_fundidname = 'Fund1' THEN DBU.abc_amount END) AS Fund1Amount,
SUM(CASE WHEN DBE.abc_fundidname = 'Fund2' THEN DBE.abc_amount END) AS Fund2Amount
FROM
Contact C
INNER JOIN
Account A ON C.parentcustomerid = A.accountid
INNER JOIN
Account PA ON A.parentaccountid = PA.accountid
INNER JOIN
abc_donation D ON D.abc_person = C.contactid
LEFT JOIN
abc_donationdetail DBU ON DBU.abc_donationid = D.abc_donationid
AND DBU.abc_fundidname= 'Fund1'
LEFT JOIN
abc_donationdetail DBE ON DBE.abc_donationid = D.abc_donationid
AND DBE.abc_fundidname = 'Fund2'
LEFT JOIN
abc_mmcs GD ON GD.abc_donor = C.contactid
LEFT JOIN
sab_item LIBU ON LIBU.sab_itemid = GD.abc_companyid
AND LIBU.sab_name = 'Fund1'
LEFT JOIN
sab_item LIBE ON LIBE.sab_itemid = GD.abc_companyid
AND LIBE.sab_name = 'Fund2'
where C.StateCode = 0 AND (GD.abc_enddate > GETDATE() or GD.abc_enddate IS NULL)
group by C.abc_memberid, C.FirstName, C.LastName , C.StateCode, A.name, A.parentaccountidname, A.dd_number, PA.dd_number, C.parentcustomeridname
order by C.lastname
Current
FN LN Total Fund1 Fund2
James Brown 70 40 30
Phillip Smith 160 60 100
Peter Jones 80 40 40
Vincent Limp 48 48 NULL
Michael Collins 60 60 NULL
Desired
FN LN Total Fund1 Fund2
James Brown 35 20 15
Phillip Smith 80 30 50
Peter Jones 40 20 20
Vincent Limp 24 24 NULL
Michael Collins 30 30 NULL
Any help would be great.
Thanks

Answer 1

If the problem is only in duplicates, than simply make a subquery:
Select fld, sum(value)
from (select distinct fld, value from tbl) as a

Answer 2

I can't say much here as there are lots of tables joined here and I don't know their schema. At most, I can suggest you to add group by with person's id and fund id as it'll remove the duplicates.
SELECT
C.FirstName, C.LastName,
SUM(D.abc_totalamount) AS TotalAllDonations,
SUM(CASE WHEN DBU.abc_fundidname = 'Fund1' THEN DBU.abc_amount END) AS Fund1Amount,
SUM(CASE WHEN DBU.abc_fundidname = 'Fund2' THEN DBU.abc_amount END) AS Fund2Amount
FROM
Contact C
INNER JOIN
Account A ON C.parentcustomerid = A.accountid
INNER JOIN
Account PA ON A.parentaccountid = PA.accountid
INNER JOIN
abc_donation D ON D.abc_person = C.contactid
LEFT JOIN
abc_donationdetail DBU ON DBU.abc_donationid = D.abc_donationid
AND (DBU.abc_fundidname= 'Fund1'
OR DBU.abc_fundidname = 'Fund2') //MERGED 2 JOINS
LEFT JOIN
abc_mmcs GD ON GD.abc_donor = C.contactid
LEFT JOIN
sab_item LIBU ON LIBU.sab_itemid = GD.abc_companyid
AND LIBU.sab_name = 'Fund1'
LEFT JOIN
sab_item LIBE ON LIBE.sab_itemid = GD.abc_companyid
AND LIBE.sab_name = 'Fund2'
where C.StateCode = 0 AND (GD.abc_enddate > GETDATE() or GD.abc_enddate IS NULL)
group by C.abc_memberid, C.FirstName, C.LastName , C.StateCode, A.name, A.parentaccountidname, A.dd_number, PA.dd_number, C.parentcustomeridname order by C.lastname
Hope it works!