Looks like a bug...
Under the engine log I can see:
2017-02-12 03:18:03,160-05 INFO [org.ovirt.engine.core.bll.UpdateVmCommand] (default task-22) [43c019b6-06b8-4c2f-bb2b-0639ebd17df9] Running command: Upd
ateVmCommand internal: false. Entities affected : ID: 5df59ddd-a70a-405e-b528-f02bdcf0d3c9 Type: VMAction group EDIT_VM_PROPERTIES with role type USER
2017-02-12 03:18:03,171-05 INFO [org.ovirt.engine.core.bll.numa.vm.SetVmNumaNodesCommand] (default task-22) [6bf7ace6] Running command: SetVmNumaNodesCom
mand internal: true.
2017-02-12 03:18:03,180-05 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-22) [6bf7ace6] EVENT_ID: NUMA_ADD_VM
_NUMA_NODE_SUCCESS(1,300), Correlation ID: 6bf7ace6, Call Stack: null, Custom Event ID: -1, Message: Add VM NUMA node successfully.
But it least it does not change VM NUMA mode, will open the bug for this issue.
Thanks