OLT delete: Flows and ports not removed from ONOS

karaf@root > flows -s                                                                       00:39:00
deviceId=of:00000a0a0a0a0a00, flowRuleCount=7
    PENDING_REMOVE, bytes=0, packets=0, table=0, priority=10000, selector=[IN_PORT:16, ETH_TYPE:ipv4, VLAN_VID:900, IP_PROTO:17, UDP_SRC:68, UDP_DST:67], treatment=[immediate=[OUTPUT:CONTROLLER], meter=METER:1, metadata=METADATA:4000000000/0]
    ADDED, bytes=0, packets=0, table=0, priority=10000, selector=[IN_PORT:1048576, ETH_TYPE:lldp], treatment=[immediate=[OUTPUT:CONTROLLER]]
    ADDED, bytes=0, packets=0, table=0, priority=10000, selector=[IN_PORT:1048576, ETH_TYPE:ipv4, IP_PROTO:17, UDP_SRC:67, UDP_DST:68], treatment=[immediate=[OUTPUT:CONTROLLER]]
    PENDING_REMOVE, bytes=0, packets=0, table=0, priority=1000, selector=[IN_PORT:16, VLAN_VID:0], treatment=[immediate=[VLAN_ID:900], transition=TABLE:1, meter=METER:1, metadata=METADATA:384004000100000/0]
    PENDING_REMOVE, bytes=0, packets=0, table=0, priority=1000, selector=[IN_PORT:1048576, METADATA:384, VLAN_VID:900], treatment=[immediate=[VLAN_POP], transition=TABLE:1, meter=METER:1, metadata=METADATA:384004000000010/0]
    PENDING_REMOVE, bytes=0, packets=0, table=1, priority=1000, selector=[IN_PORT:1048576, METADATA:10, VLAN_VID:900], treatment=[immediate=[VLAN_ID:0, OUTPUT:16], meter=METER:1, metadata=METADATA:4000000000/0]
    PENDING_REMOVE, bytes=0, packets=0, table=1, priority=1000, selector=[IN_PORT:16, VLAN_VID:900], treatment=[immediate=[VLAN_PUSH:vlan, VLAN_ID:900, OUTPUT:1048576], meter=METER:1, metadata=METADATA:4000000000/0]

karaf@root > ports                                                                          00:39:05
id=of:00000a0a0a0a0a00, available=false, local-status=disconnected 15m2s ago, role=NONE, type=SWITCH, mfr=VOLTHA Project, hw=open_pon, sw=open_pon, serial=BBSIM_OLT_0, chassis=a0a0a0a0a00, driver=voltha, channelId=10.1.24.49:36494, managementAddress=10.1.24.49, protocol=OF_13
  port=1048576, state=disabled, type=fiber, speed=0 , adminState=enabled, portMac=0a:0a:0a:0a:0a:00, portName=nni-1048576