I have not looked at the Data lists but the * means to copy 'everything', and the 'Data3e.lst' specifies the files which have already been allocated to other lists, this means all the lists are included, so whatever files appear on Data1 and Data2 lists will also appear on the 'Data3e.lst' exception list.
So Data3 list wants to include 'everything'
except what has already been copied to Data1 and Data2 lists.
EDIT: I have now looked at the lists, GigaDestroyer is correct. 'dlc_2\*' should also be in the Data3e.lst.
'dlc_2\*' is in 'Data6.list' and because it does not appear on the Data3e.lst it IS being copied to both Data3 and Data6.