service did not deregistered properly

I have both consul cluster and nomad cluster running in the same 3 nodes(node-0, node-1, node-2) and a service call `goddess-of-harvest` running with count of 2, deployed by nomad.

After releasing several versions of that service, I noticed a zombie service occured.

After checking the consul log file, I noticed the service was synced and deregistered infinitely. Below is the consul log.

```
2017/06/07 17:24:57 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:01 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:02 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:06 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:07 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:11 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:12 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:16 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:17 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:21 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:22 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:26 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:27 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:31 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:32 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:36 [INFO] agent: Deregistered service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
2017/06/07 17:25:37 [INFO] agent: Synced service '_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service'
```

I tried to call consul deregister api `curl -v --request PUT "http://127.0.0.1:8500/v1/agent/service/deregister/goddess-of-harvest-fe"`. Nothing happened and the service can still be seen in `v1/catalog/service` api response.

What was strange, however, the consul log said `service does not exist`.

```
2017/06/07 16:59:47 [WARN] agent: Failed to deregister service "goddess-of-harvest-fe": Service does not exist
```

I also tried to call deregister api `curl --request PUT --data @payload.json http://127.0.0.1:8500/v1/catalog/deregister` with payload file to deregister the service.

```
{
"Datacenter": "dc1",
"Node": "node-2",
"ServiceID": "_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service"
}
```

Althought that PUT request returned true, consul catalog api told me the service was still available.

`curl -s localhost:8500/v1/catalog/service/goddess-of-harvest-fe | jq .`

```
[
{
"ModifyIndex": 28094261,
"CreateIndex": 28094261,
"ServiceEnableTagOverride": false,
"Node": "node-2",
"Address": "10.0.1.10",
"TaggedAddresses": {
"wan": "10.0.1.10",
"lan": "10.0.1.10"
},
"ServiceID": "_nomad-executor-4f37671b-4e02-88cd-e445-94fc626f1f8c-goddess-of-harvest-fe-goddess-of-harvest-fe-goddess-of-harvest-fe-http-service",
"ServiceName": "demeter-fe",
"ServiceTags": [
"demeter-fe",
"http-service"
],
"ServiceAddress": "10.0.1.10",
"ServicePort": 38846
}
]
```

### `consul info` for both Client and Server
Client:
```
agent:
check_monitors = 0
check_ttls = 0
checks = 3
services = 4
build:
prerelease =
revision = '21f2d5a
version = 0.7.5
consul:
known_servers = 3
server = false
runtime:
arch = amd64
cpu_count = 1
goroutines = 43
max_procs = 1
os = linux
version = go1.7.5
serf_lan:
encrypted = false
event_queue = 0
event_time = 39
failed = 0
health_score = 0
intent_queue = 0
left = 0
member_time = 2039
members = 35
query_queue = 0
```

Server:

```
agent:
check_monitors = 0
check_ttls = 0
checks = 3
services = 5
build:
prerelease =
revision = 'a9455cd
version = 0.7.1
consul:
bootstrap = false
known_datacenters = 1
leader = false
leader_addr = 10.0.1.3:8300
server = true
raft:
applied_index = 28168266
commit_index = 28168266
fsm_pending = 0
last_contact = 50.741295ms
last_log_index = 28168266
last_log_term = 43
last_snapshot_index = 28167119
last_snapshot_term = 43
latest_configuration = [{Suffrage:Voter ID:10.0.1.2:8300 Address:10.0.1.2:8300} {Suffrage:Voter ID:10.0.1.3:8300 Address:10.0.1.3:8300} {Suffrage:Voter ID:10.0.1.4:8300 Address:10.0.1.4:8300}]
latest_configuration_index = 4247902
num_peers = 2
protocol_version = 1
protocol_version_max = 3
protocol_version_min = 0
snapshot_version_max = 1
snapshot_version_min = 0
state = Follower
term = 43
runtime:
arch = amd64
cpu_count = 2
goroutines = 209
max_procs = 2
os = linux
version = go1.7.3
serf_lan:
encrypted = false
event_queue = 0
event_time = 39
failed = 0
health_score = 0
intent_queue = 0
left = 0
member_time = 2039
members = 35
query_queue = 0
query_time = 2459
serf_wan:
encrypted = false
event_queue = 0
event_time = 1
failed = 0
health_score = 0
intent_queue = 0
left = 0
member_time = 1
members = 1
query_queue = 0
query_time = 1
```

My consul version is `Consul v0.7.1` and noamd version is `Nomad v0.5.4`.

Thanks