ASA interfaces missing and some show up with Ifindex naming.

I have a two fold issue. I am testing out with some firewalls specifically a Cisco 5550.
I have gone through the documentation to configure ASA Netflow as noted in this forum post.
http://forums.manageengine.com/topic/ifindex-is-showing-as-interface-name

What i see is out of 14 interfaces only 11 are showing up and out of them 5 have an IfIndex naming convention.
I ran snmpwalk.sh (with command below) and can see all the interfaces properly being retrieved via the walk.

snmpwalk.sh<ROUTER_IP><SNMP_PORT><SNMP_READ_COMMUNITY>

I have confirmed all the interfaces are being managed for this device but only see 11 in the count.
I also have confirmed the naming option is chosen for the specific device i am troubleshooting via the SET SNMP tab.

Can you advise on what my next step/s should be please? Looking forward to your reply.