exp saves datafile sizes incorrectly

Oracle 8.1.7.2 on AIX

Anyone else ever see this? Is this a bug? I have a large LMT with 18 datafiles of 2000.0625 mb (except one). That is 2000m + 64k. When I do a full database export and grep the create tablespace lines from the export file, the datafile sizes do not match what's in the database! It's generating datafiles that are exactly 2000m and do not have the extra 64k. Am I doing something wrong? Am I missing something on how exp works? Figured I'd ask here before reporting it on metalink as a bug.

SQL> r
  1 SELECT file_name, bytes/1048576
  2 FROM dba_data_files
  3* WHERE tablespace_name = 'ACTION_D'

FILE_NAME                                BYTES/1048576
---------------------------------------- -------------


/u201/oradata/MCPROD/action_d01.dbf          2000.0625

/u201/oradata/MCPROD/action_d02.dbf          2000.0625

/u201/oradata/MCPROD/action_d03.dbf          2000.0625

/u201/oradata/MCPROD/action_d04.dbf          2000.0625

/u201/oradata/MCPROD/action_d05.dbf          2000.0625

/u206/oradata/MCPROD/action_d06.dbf          2000.0625

/u206/oradata/MCPROD/action_d07.dbf          2000.0625

/u206/oradata/MCPROD/action_d08.dbf          2000.0625

/u206/oradata/MCPROD/action_d09.dbf          2000.0625

/u206/oradata/MCPROD/action_d10.dbf          1500.0625

/u201/oradata/MCPROD/action_d11.dbf           950.0625

/u208/oradata/MCPROD/action_d12.dbf          2000.0625

/u208/oradata/MCPROD/action_d13.dbf          2000.0625

/u208/oradata/MCPROD/action_d14.dbf          2000.0625

/u208/oradata/MCPROD/action_d15.dbf          2000.0625

/u208/oradata/MCPROD/action_d16.dbf          2000.0625

/u208/oradata/MCPROD/action_d17.dbf          2000.0625

/u208/oradata/MCPROD/action_d18.dbf          2000.0625

/u210/oradata/MCPROD/action_d19.dbf          2000.0625

19 rows selected.

grep -i "CREATE TABLESPACE ACTION_D" myexp.dat

CREATE TABLESPACE "ACTION_D" DATAFILE '/u201/oradata/MCPROD/action_d01.dbf' SIZE 2000M REUSE, '/u201/oradata/MCPROD/action_d02.dbf' SIZE 2000M REUSE,

'/u201/oradata/MCPROD/action_d03.dbf' SIZE 2000M REUSE,
'/u201/oradata/MCPROD/action_d04.dbf' SIZE 2000M REUSE,
'/u201/oradata/MCPROD/action_d05.dbf' SIZE 2000M REUSE,
'/u206/oradata/MCPROD/action_d06.dbf' SIZE 2000M REUSE,
'/u206/oradata/MCPROD/action_d07.dbf' SIZE 2000M REUSE,
'/u206/oradata/MCPROD/action_d08.dbf' SIZE 2000M REUSE,
'/u206/oradata/MCPROD/action_d09.dbf' SIZE 2000M REUSE,
'/u206/oradata/MCPROD/action_d10.dbf' SIZE 1500M REUSE,
'/u201/oradata/MCPROD/action_d11.dbf' SIZE 996212736 REUSE,
'/u208/oradata/MCPROD/action_d12.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d13.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d14.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d15.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d16.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d17.dbf' SIZE 2000M REUSE,
'/u208/oradata/MCPROD/action_d18.dbf' SIZE 2000M REUSE,
'/u210/oradata/MCPROD/action_d19.dbf' SIZE 2000M REUSE