This article gives explanation of why don’t you see any attack object/attacks in some of the predefined attack groups.
Attack object/attacks are not displayed in some of the predefined attack groups. The following screenshot for NSM which shows "VOIP - Critical" predefined group which shows no attack member.
Some of the attack groups do not have any group members; they are made for future use. In the future, when predefined attacks are defined in their respective categories, these attack groups will be updated to the device.
[root@defaulthost ~]# less /usr/idp/device/state/s0/policy.set
root% less /var/db/idpd/sets/ <policy-name> .set