when execute expdp we lost one service on service_names parameter (RAC 11.2.0.4)

Hi friends, when we execute this:

oracle@bcn1-db-oracle-1$ expdp admin tables=table_1 directory=....

<

Export: Release 11.2.0.4.0 - Production on Fri Jul 29 10:16:08 2016

.

.

. . exported table_1

3.633 MB

6257 rows

Master table "ADMIN"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded

In the alert log of this instance:

ALTER SYSTEM SET service_names='prim_db',.....

ALTER SYSTEM SET service_names='SYS$SYS.KUPC$C_1_20160729101614.EDREAL','prim_db'.....

But service prim_db dissapear from parameter service_names!!

In the v$active services and in the cluster:

SQL> select name from v$active_services order by 1;

prim_db

.

.

oracle@bcn1-db-oracle-105p1:~$ crsctl stat res -t

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Cluster Resources