Why "Skaffold" creates 2 different images for each container?

I have a Skaffold file like this:

apiVersion: skaffold/v4beta1
kind: Config
build:
  artifacts:
  - image: app/auth
    context: auth
    sync:
      manual:
      - src: src/**/*.ts
        dest: .
    docker:
      dockerfile: Dockerfile

And deploymant files like following:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-depl
spec:
  replicas: 1
  selector:
    matchLabels:
      app: auth
  template:
    metadata:
      labels:
        app: auth
    spec:
      containers:
        - name: auth
          image: app/auth
          env:
            - name: MONGO_URI
              value: 'mongodb://auth-mongo-srv:27017/auth'
            - name: JWT_KEY
              valueFrom:
                secretKeyRef:
                  name: jwt-secret
                  key: JWT_KEY

---
apiVersion: v1
kind: Service
metadata:
  name: auth-srv
spec:
  selector:
    app: auth
  ports:
    - name: auth
      protocol: TCP
      port: 3000
      targetPort: 3000

With a Dockerfile like below:

FROM node:alpine

WORKDIR /app
COPY package.json .
RUN npm install --only=prod
COPY . .

CMD ["npm", "start"]

But after running skaffold dev I see a list of docker images like this:

REPOSITORY                       TAG                                                                IMAGE ID       CREATED             SIZE
app/auth               429eadf4af2ad66af9f364eb3cfe8926e05276c4f579fe39c5112e3201b1e4ac   429eadf4af2a   15 minutes ago      345MB
app/auth               latest                                                             429eadf4af2a   15 minutes ago      345MB

Is it normal to have 2 different images for each container?