The PSPNG isn't removing groups upon Group deletion, requiring a full sync to remove the group:

grouper-api;grouper_debug.log;training;3.2.0_full_demo;2018-04-12 04:18:00,030: [DefaultQuartzScheduler_Worker-10] INFO  ProvisioningWorkItem.setStatus(143) -  - Work item handled: ProvisioningWorkItem[successful=true,msg=Ignoring work item because group is not provisioned,clog=clog #7934 / ChangeLog type: membership: deleteMembership,group=test:abcd,subject=jgasper@ldap]grouper-api;grouper_debug.log;training;3.2.0_full_demo;2018-04-12 04:18:00,031: [DefaultQuartzScheduler_Worker-10] INFO  ProvisioningWorkItem.setStatus(143) -  - Work item handled: ProvisioningWorkItem[successful=true,msg=Ignoring work item because group is not provisioned,clog=clog #7935 / ChangeLog type: membership: deleteMembership,group=test:abcd,subject=aanderson@ldap]grouper-api;grouper_debug.log;training;3.2.0_full_demo;2018-04-12 04:18:00,032: [DefaultQuartzScheduler_Worker-10] INFO  ProvisioningWorkItem.setStatus(143) -  - Work item handled: ProvisioningWorkItem[successful=true,msg=Ignoring work item because group is not provisioned,clog=clog #7936 / ChangeLog type: group: deleteGroup,group=test:abcd]

https://github.com/Internet2/grouper/blob/master/grouper-misc/grouper-pspng/src/main/java/edu/internet2/middleware/grouper/pspng/Provisioner.java#L432 needs to handle group deletions differently.