Get on configuration of one of the interfaces returns two ips:
{
"enabled": true,
"ietf-ip:ipv4": {
"address": [

{ "ip": "192.168.21.21", "prefix-length": 24 }

,

{ "ip": "192.168.21.23", "prefix-length": 24 }

]
},
"name": "TenGigabitEthernet81/0/0",
"type": "iana-if-type:ethernetCsmacd",
"v3po:ethernet":

{ "mtu": 9216 }

,
"vpp-vlan:sub-interfaces": {}
}

But vppctl show only one ip on that interface. When attempting to remove one of the ips, vppctl says that it doesn't exist:
[root@overcloud-novacompute-0 ~]# vppctl set interface ip address del TenGigabitEthernet81/0/0 192.168.21.23/24
set interface ip address: 192.168.21.23/24 not found for interface TenGigabitEthernet81/0/0