the value for APPLFSTT in $TNS_ADMIN/listener.ora

Hi Experts

CT applied patch 11776182, during it,Autoconfig is run automatically

but after that CT found the value for APPLFSTT in $TNS_ADMIN/listener.ora is changed.

Before patching

APPLFSTT=<SID>

After patching

APPLFSTT=<SID>_BALANCE;<SID>_FO;<SID>,

Could you tell me what cause the change?

and I checked some environment,and found the value for APPLFSTT in $TNS_ADMIN/listener.ora in other environment

is <SID>_BALANCE;<SID>_FO;<SID>,though I didn't apply any patch to them.

Could you give me some advice on why only in  this environment , APPLFSTT's value is <SID> before patching?

Thanks&Regards