parallel hint with group by gives wrong results

query with no  parallel hint and parallel degree 7 set on some of the 
tables(including table  that is hinted) gives right answer but is "too slow"
  
 query with parallel  hint and no specified degree(ie default degree)  and 
parallel degree 7 set on  some of the tables(including table that is hinted) 
gives wrong answer by factor  of default degree and is fast enough.
  
 The query has a sum  and a group by, the sum is off by multiple of the default 
degree(24) when the parallel hint  is given. Anyone know about any "features" 
relating to sum/group by/parallel  hint/default degree.
  
 all help  welcome.
  
 john

       
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