I have a deployment file with replicas set to 1. So when I do 'kubectl get ...' I get 1 record each for deployment, replicaset and pod.

Now I set replicas to 2 in deployment.yaml, apply it and when I run 'kubectl get ..' command, I get 2 records each for deployments, replicaset and pods each.

Shouldn't previous deployment be overwritten, hence resulting in a single deployment, and similar for replicaset(2 pods are ok as now replicas is set to 2)?

This is deployment file content:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16
        ports:
        - containerPort: 80