TPC-DS Query 33 and simplified variants return wrong results

WITH ss 
     AS (SELECT i_manufact_id, 
                Sum(ss_ext_sales_price) total_sales 
         FROM   store_sales, 
                date_dim, 
                customer_address, 
                item 
         WHERE  i_manufact_id IN (SELECT i_manufact_id 
                                  FROM   item 
                                  WHERE  i_category IN ( 'Books' )) 
                AND ss_item_sk = i_item_sk 
                AND ss_sold_date_sk = d_date_sk 
                AND d_year = 1999 
                AND d_moy = 3 
                AND ss_addr_sk = ca_address_sk 
                AND ca_gmt_offset = -5 
         GROUP  BY i_manufact_id), 
     cs 
     AS (SELECT i_manufact_id, 
                Sum(cs_ext_sales_price) total_sales 
         FROM   catalog_sales, 
                date_dim, 
                customer_address, 
                item 
         WHERE  i_manufact_id IN (SELECT i_manufact_id 
                                  FROM   item 
                                  WHERE  i_category IN ( 'Books' )) 
                AND cs_item_sk = i_item_sk 
                AND cs_sold_date_sk = d_date_sk 
                AND d_year = 1999 
                AND d_moy = 3 
                AND cs_bill_addr_sk = ca_address_sk 
                AND ca_gmt_offset = -5 
         GROUP  BY i_manufact_id), 
     ws 
     AS (SELECT i_manufact_id, 
                Sum(ws_ext_sales_price) total_sales 
         FROM   web_sales, 
                date_dim, 
                customer_address, 
                item 
         WHERE  i_manufact_id IN (SELECT i_manufact_id 
                                  FROM   item 
                                  WHERE  i_category IN ( 'Books' )) 
                AND ws_item_sk = i_item_sk 
                AND ws_sold_date_sk = d_date_sk 
                AND d_year = 1999 
                AND d_moy = 3 
                AND ws_bill_addr_sk = ca_address_sk 
                AND ca_gmt_offset = -5 
         GROUP  BY i_manufact_id) 
SELECT i_manufact_id, 
               Sum(total_sales) total_sales 
FROM   (SELECT i_manufact_id, total_sales 
        FROM   ss 
        UNION ALL 
        SELECT i_manufact_id, total_sales
        FROM   cs 
        UNION ALL 
        SELECT i_manufact_id, total_sales
        FROM   ws) tmp1 
GROUP  BY i_manufact_id 
ORDER  BY total_sales
LIMIT 10;

Drill Results:
+---------------+-------------+
| i_manufact_id | total_sales |
+---------------+-------------+
| 440           | 0.12        |
| 434           | 13.16       |
| 415           | 14.04       |
| 449           | 15.63       |
| 563           | 31.46       |
| 357           | 49.50       |
| 624           | 67.94       |
| 192           | 74.40       |
| 137           | 83.42       |
| 240           | 85.26       |
+---------------+-------------+
10 rows selected (7.57 seconds)

Postgres Results:
 i_manufact_id | total_sales 
---------------+-------------
           930 |        1.18
           818 |       41.86
           913 |      141.90
           784 |      184.90
           488 |      275.08
           993 |      301.60
           700 |      340.52
           895 |      802.30
           766 |      839.76
           858 |      859.18
(10 rows)

SELECT sum(x)
FROM
(SELECT ss_ext_sales_price x, ss_item_sk
FROM  store_sales
 GROUP BY ss_item_sk, ss_ext_sales_price
UNION ALL
SELECT cs_ext_sales_price x, cs_item_sk
FROM catalog_sales
GROUP BY cs_item_sk, cs_ext_sales_price) tmp
GROUP BY x
LIMIT 10;

Drill Results:
+------------+
|   EXPR$0   |
+------------+
| 14141.40   |
| 28060.00   |
| 30912.70   |
| 43706.88   |
| 38267.64   |
| 10173.00   |
| 37829.25   |
| 5349.50    |
| 107515.80  |
| 4440.84    |
+------------+
10 rows selected (14.435 seconds)

Postgres Results:
   sum    
----------   
 45234.00
  5735.31
  2275.60
  6921.32
  2590.46
  6615.09
 14080.77
 24819.76
 25127.20
(10 rows)

SELECT sum(x)
FROM
(SELECT sum(ss_ext_sales_price) x, ss_item_sk
FROM  store_sales
 GROUP BY ss_item_sk
UNION ALL
SELECT sum(cs_ext_sales_price) x, cs_item_sk
FROM catalog_sales
GROUP BY cs_item_sk) tmp
GROUP BY x
LIMIT 10;

Drill Results:
+------------+
|   EXPR$0   |
+------------+
| 211411.58  |
| 347027.93  |
| 534760.93  |
| 203028.28  |
| 500939.61  |
| 248226.81  |
| 242664.29  |
| 597659.03  |
| 258909.73  |
| 223624.06  |
+------------+
10 rows selected (5.245 seconds)

Postgres Results:
    sum    
-----------
 252711.42
 173571.97
 206191.60
 249793.96
 170825.75
 127718.29
 220887.50
 119390.44
 217495.66
 284348.93
(10 rows)

SELECT x
FROM
(SELECT ss_ext_sales_price x, ss_item_sk
FROM  store_sales
 GROUP BY ss_item_sk, ss_ext_sales_price
UNION ALL
SELECT cs_ext_sales_price x, cs_item_sk
FROM catalog_sales
GROUP BY cs_item_sk, cs_ext_sales_price) tmp
GROUP BY x
LIMIT 10;

Drill Results:
+------------+
|     x      |
+------------+
| 271.95     |
| 561.20     |
| 391.30     |
| 1821.12    |
| 2125.98    |
| 1695.50    |
| 1513.17    |
| 411.50     |
| 4674.60    |
| 193.08     |
+------------+
10 rows selected (9.518 seconds)

Postgres Results:
    x    
---------
 9046.80
 5735.31
  568.90
 3460.66
 1295.23
 6615.09
 4693.59
 6204.94
 6281.80
(10 rows)