Appear inplace of going into new tablespace its imported into existing tablespace,
can you crosscheck it in dba_segments view (tablespace column).
Also have you used REMAP_TABLESPACE while doing import if this activity was performed by datapump.
we have not used datapump for import.
what we observed is, new DBS file is getting created and also the size of existing DBS file is getting increased.
this issue is observed with Oracle 10 client.
i am not able to get any useful info from dba_segments table..
is there any other way?