Global Log Receiver - HTTP Receiver keeps sending the same logs

I have set up an HTTP receiver as follows:

{
  "metadata": {
    "name": "syslog-ng",
    "namespace": "shared",
    "labels": {},
    "annotations": {},
    "disable": false
  },
  "spec": {
    "ns_list": {
      "namespaces": [
        "my-company"
      ]
    },
    "http_receiver": {
      "uri": "http://xxx.xxx.xxx.xxx:8084",
      "auth_none": {},
      "compression": {
        "compression_none": {}
      },
      "batch": {
        "timeout_seconds_default": {},
        "max_events_disabled": {},
        "max_bytes_disabled": {}
      },
      "no_tls": {}
    },
    "security_events": {}
  }
}

I receive logs but they get repeated on every new POST.

The Test Connection button fails with 504 Gateway Timeout. 

On the receiving end, I have a syslog-ng with HTTP receiver, not much configured there. 

Any ideas?