Filter doesn't work the same on a Query where field is on a different table

I have a query that works perfectly but when I try to query a field that's on a joined table it doesn't apply the same way? I have a quite a few joins and most just pull fields straightforwardly. Some of the fields I have to pull from multiple rows and combine in a parent-child way into one row.  Please see below....

"SELECTDISTINCTTABLEA.[Contract Number],

 STUFF((SELECT'/ '+ [User Name]

          FROM  TABLEAT

                WHERET.[Contract Number]= TABLEA.[Contract Number]ANDT.[User Role]='Admin'FORXML PATH(''),

                              Type).value('text()[1]','nvarchar(max)'), 1, 2, '')AS [Admin],

 STUFF((SELECT' - '+ CONVERT(varchar(12),[DATE_OF_TRAINING], 107)

          FROM  TABLEAT

                WHERET.[Contract Number]=  TABLEA.[Contract Number]FORXML PATH(''),

                              Type).value('text()[1]','nvarchar(max)'), 1, 2, '')AS [DATE_OF_TRAINING]

FROM        TABLEFRIGHTOUTERJOIN

                     TABLEEON TABLEF.SELLERID=TABLEE.SALES_REP_IDLEFTOUTER JOIN

                     TABLEDON TABLEE.PRIMCODE=TABLED.CODERIGHTOUTER JOIN

                     TABLEAINNERJOIN

                     TABLEBON TABLEA.[Contract Number]=TABLEB.[Contract Number]ON

                     TABLEE.C_ONUM=TABLEB.ONUMLEFTOUTER JOIN

                     TABLECON TABLEB.[Contract Number]=TABLEC.[Contract Number]"

This Yields

CONTRACT #    Admin               Date of Training

xx-xx-123          Jon             Apr,28 2010 - Apr, 28,2010 - Apr,28 2010

 But when I add in this filter to my second statement it yields nothing in the "date of training" column.

" STUFF((SELECT' - '+ CONVERT(varchar(12),[DATE_OF_TRAINING], 107)

          FROM  TABLEAT

                WHERET.[Contract Number]= TABLEA.[Contract Number]ANDT.[User Role]='Admin' FORXMLPATH(''),

                              Type).value('text()[1]','nvarchar(max)'), 1, 2, '')AS [DATE_OF_TRAINING]"