Gab membership showing two instances

Hi,

I configured VCS  6.0 in Sol 10, when i put gabconfig -a command it shows the below status,I am not able to get it why it is showing 2 membership, it should be one, please state its reason and help to resolve it.

bash-3.00# /sbin/gabconfig -a
GAB Port Memberships
===============================================================
Port a gen 18f401 membership 0
Port h gen 18f405 membership 0
 

Kindly let me know if anything else required from my side.