Istio routing to same postgres db even when separate gateway and virtual service exist for separate DBs

Networking
1

I am running two postgres DBs in pods and trying to access the pods via Istio ingressgateway (with Network Load Balancer).
i have created 2 separate gateways and Virtual services for each DB (pg3.example.com and pg4.example.com). For some reason, when I am trying to connect with hostname, it connects to same host every time.

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: postgres-gateway
  namespace: istio-test
spec:
  selector:
    istio: ingressgateway 
  servers:
  - hosts:
    - 'pg3.example.com'
    port:
      number: 5432
      name: tcp-postgres
      protocol: TCP

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: postgres-gateway-2
  namespace: istio-test
spec:
  selector:
    istio: ingressgateway 
  servers:
  - hosts:
    - 'pg4.example.com'
    port:
      number: 5432
      name: tcp-postgres
      protocol: TCP

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: postgres-vs
  namespace: istio-test
spec:
  hosts:
  - 'pg3.example.com'
  gateways:
  - postgres-gateway
  tcp:
  - match:
    - port: 5432
    route:
    - destination:
        host: postgresql-dev
        port:
          number: 5432
        subset: postgres-0

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: postgres-vs-2
  namespace: istio-test
spec:
  hosts:
  - 'pg4.example.com'
  gateways:
  - postgres-gateway-2
  tcp:
  - match:
    - port: 5432
    route:
    - destination:
        host: postgresql-new-dev-istio
        port:
          number: 5432
        subset: postgres-1

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: postgres-0
  namespace: istio-test
spec:
  host: postgresql-dev.istio-test.svc.cluster.local
  subsets:
  - labels:
      app.kubernetes.io/instance: postgresql-dev
    name: postgres-0
  trafficPolicy:
    tls:
      mode: ISTIO_MUTUAL
      sni: postgresql-dev.istio-test.svc.cluster.local

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: postgres-1
  namespace: istio-test
spec:
  host: postgresql-new-dev-istio.istio-test.svc.cluster.local
  subsets:
  - labels:
      app.kubernetes.io/instance: postgresql-new-dev-istio
    name: postgres-1
  trafficPolicy:
    tls:
      mode: ISTIO_MUTUAL
      sni: postgresql-new-dev-istio.istio-test.svc.cluster.local