onos 1.5.0-SNAPSHOT meter rest api problem

I test using meter rest api of the 1.5.0-SNAPSHOT,
I tried the following step 1,2,3 many times ,
always get the same problem.

1.
add meter by rest api , then input 'meters' commands in CLI display correctly.
post http://127.0.0.1:8181/onos/v1/meters/of:0000d688c4e9d344
{
"id": 1,
"deviceId": "of:0000d688c4e9d344",
"unit": "KB_PER_SEC",
"bands": [

]
}
first few secounds show "PENDING_ADD"
onos> meters
DefaultMeter{device=of:0000d688c4e9d344, id=1, appId=org.onosproject.rest, unit=KB_PER_SEC, isBurst=false, state=PENDING_ADD, bands=[DefaultBand

]}

2.
DELTE by rest api
http://127.0.0.1:8181/onos/v1/meters/of:0000d688c4e9d344/1
meters delete correctly.
then input 'meters' commands in CLI display correctly.
first few secounds show "PENDING_REMOVE"
later meter is deleted.

3.
repeat POST as step 1.
then always get PENDING_ADD
onos> meters
DefaultMeter{device=of:0000d688c4e9d344, id=2, appId=org.onosproject.rest, unit=KB_PER_SEC, isBurst=false, state=PENDING_ADD, bands=[DefaultBand

]}

meters can not be added correctly after the first add and delete loop.

log always print METER_EXISTS, in ovs side meter has add meter success. but onos is always PENDING_ADD

root@ubuntu:~# tail -F $KARAF_LOG
2016-01-15 00:05:22,416 | ERROR | w I/O worker #10 | OFChannelHandler                 | 164 - org.onosproject.onos-of-ctl - 1.5.0.SNAPSHOT | OFMeterModFailedErrorMsgVer13(xid=2, code=METER_EXISTS, data=OFMeterModVer13(xid=2, command=0, flags=1, meterId=2, meters=[OFMeterBandDscpRemarkVer13(rate=10, burstSize=0, precLevel=20)])) from switch org.onosproject.driver.handshaker.NiciraSwitchHandshaker [/127.0.0.1:40502 DPID[00:00:d6:88:c4:e9:d3:44]] in state ACTIVE
2016-01-15 00:05:22,422 | WARN  | f-event-stats-26 | OpenFlowRuleProvider             | 167 - org.onosproject.onos-of-provider-flow - 1.5.0.SNAPSHOT | Received error message OFMeterModFailedErrorMsgVer13(xid=2, code=METER_EXISTS, data=OFMeterModVer13(xid=2, command=0, flags=1, meterId=2, meters=[OFMeterBandDscpRemarkVer13(rate=10, burstSize=0, precLevel=20)])) from 00:00:d6:88:c4:e9:d3:44