query question

I have this query

SELECT 
 pv.id,
 pv.prefix,
 pv.[first name],
 pv.[middle name],
 pv.[last name],
 pv.[company name],
 pv.[address line 1],
 pv.[address line 2],
 pv.[address line 3],
 pv.city,
 pv.[state],
 pv.zip,
 pv.[address type],
 pv.[preferred email],
 pv.cell,
 pv.home,
 c.[life largest amount],
 c.[largest amount date],
 c.[life smallest amount],
 c.[smallest amount date],
 c.[last amount],
 c.[last amount date],
 c.[first amount],
 c.[first amount date],
 c.[sum of gifts],
 c.[sum paid to date],
 c.[sum np gifts],
 c.[sum soft credit]
FROM   preferred_mail_view pv
       CROSS apply (SELECT Max(CASE
                                 WHEN l = 1 THEN amt
                                 ELSE NULL
                               END)  [Life Largest Amount],
                           Max(CASE
                                 WHEN l = 1 THEN contrib_date
                                 ELSE NULL
                               END)  [Largest Amount Date],
                           Max(CASE
                                 WHEN s = 1 THEN amt
                                 ELSE NULL
                               END)  [Life Smallest Amount],
                           Max(CASE
                                 WHEN s = 1 THEN contrib_date
                                 ELSE NULL
                               END)  [Smallest Amount Date],
                           Max(CASE
                                 WHEN d = 1 THEN amt
                                 ELSE NULL
                               END)  [Last Amount],
                           Max(CASE
                                 WHEN d = 1 THEN contrib_date
                                 ELSE NULL
                               END)  [Last Amount Date],
                           Max(CASE
                                 WHEN a = 1 THEN amt
                                 ELSE NULL
                               END)  [First Amount],
                           Max(CASE
                                 WHEN a = 1 THEN contrib_date
                                 ELSE NULL
                               END)  [First Amount Date],
                           Sum(CASE
                                 WHEN contrib_type = 'GF' THEN amt
                                 ELSE 0
                               END)  [Sum of Gifts],
                           Sum(CASE
                                 WHEN contrib_type = 'PP' THEN amt
                                 ELSE 0
                               END)  [Sum Paid to Date],
                           Sum(CASE
                                 WHEN contrib_type = 'NP' THEN amt
                                 ELSE NULL
                               END)  [Sum NP Gifts],
                           Sum(ammt) [Sum Soft Credit]
                    FROM   (SELECT cdd.condes_hard_credit_amt amt,
                                c.contrib_date,
                                cdd.condes_soft_credit_amt ammt,
                                Row_number() OVER (ORDER BY condes_hard_credit_amt DESC) L,
                                Row_number() OVER (ORDER BY condes_hard_credit_amt ASC)  S,
                                Row_number() OVER (ORDER BY contrib_date DESC)           D,
                                Row_number() OVER (ORDER BY contrib_date ASC)            A,
                                contrib_type
                            FROM   contrib_donor cd
                                INNER JOIN contrib_donor_desig cdd ON cd.contrib_donor_id = cdd.condes_contrib_donor
                                INNER JOIN contribution c ON cdd.condes_contribution = c.contribution_id
                           WHERE  cd.cond_donor = pv.id
                           AND ( c.contrib_type IN ( 'GF', 'NP', 'PP' ) )
                           ) t
            ) c; 

everything was find until I added [Sum Soft Credit], for some people it is right but for some people I get nulls for life smallest amount or last amount randomly, what could this be?