Help: Strange storage behaviour when using parallel

I created an index like this

create index sensor_data_id_pk
on sensor_data_200one (sensor_data_id)
local
storage (initial 200m next 200m)
tablespace indx
nologging
parallel (degree 2)

But when I query the dictionary, I got the following results:

PARTITION_NAME                 INITIAL_EXTENT NEXT_EXTENT    EXTENTS
------------------------------ -------------- ----------- ----------
FEB_2001                            209715200   327680000          3
MAR_2001                            209715200   327680000          3
APR_2001                            209715200   327680000          3
MAY_2001                            209715200   262144000          2
JUN_2001                            209715200   327680000          3
JUL_2001                            209715200   327680000          3
AUG_2001                            209715200   327680000          3
SEP_2001                            209715200   327680000          3
OCT_2001                            209715200   409600000          4
NOV_2001                            209715200   209715200          1
JAN_2001                            209715200   409600000          4

The next_extent is change from partition to partition, could somebody tell me why?

Thanks  

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