Impdp duplicates tables/records ...... 820 records out of 410

I'm performing a Improt DataPump in a 11.2.0.4 DB in RedHat 6.6, during the import, there are some tables imported twice and duplicating records

Here's the impdp command: impdp dumpfile=expdp_dir1:expdp_full_AFSRDL_04162015_1800_%U.dmp, expdp_dir2:expdp_full_AFSRDL_04162015_%U/dmp full=y logfile=impdp_exclude_AFSRDL_10g_04162015_Apr-18.log content=all parallel=7 parfile=exclude.par table_exists_action-skip

Here's an example of the problem: there's a table with 410 records perfectly imported, but few tables later, the same table is imported again, but this time the message says is importing 820 records out of 410; exact same situation is repeated in some other tables.