Why is this session not connecting to the preferred Instance ?

Grid Infrastructure/DB Version : 11.2.0.3
Platform : RHEL 5.8
We have a 3-node cluster and I've configured the RAC service PKDS_UAT_01 with its preferred instance as JDSCFS3
$ srvctl config service -s PKDS_UAT_01 -d JDSCFS
Service name: PKDS_UAT_01
Service is enabled
Server pool: JDSCFS_PKDS_UAT_01
Cardinality: 1
Disconnect: false
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: false
Failover type: NONE
Failover method: NONE
TAF failover retries: 0
TAF failover delay: 0
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: NONE
Edition:
Preferred instances: JDSCFS3
Available instances: JDSCFS1
Then I start a remote session through SQL*Plus like
sqlplus scott/tiger@rtfms-scan:1624/PKDS_UAT_01.acproot.net
When I check in the DB, it shows that the session is actually connected to instance 1 despite the preferred instance set as Instance3 (JDSCFS3) for the service PKDS_UAT_01
SQL> select inst_id, sid from gv$session where username='SCOTT';
   INST_ID        SID
         1       3839
Why is this happening ?

1. check that all services are running on all nodes. Actually, you service should run only on preffered node
srvctl status service -d db_name
2. restart services
3. try again
Regards
Ed

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