I've been learning about how to deploy ambassador on kubernetes on minikube by this tutorial, and that works as I can see the page for successfully installed ambassador. The main problem is, when I try to change the image of the UI such that it should open other app in the link, it opens the same successfull page of ambassador.

Previous tour.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: tour
  annotations:
    getambassador.io/config: |
      ---
      apiVersion: ambassador/v1
      kind: Mapping
      name: tour-ui_mapping
      prefix: /
      service: tour:5000
      ---
      apiVersion: ambassador/v1
      kind: Mapping
      name: tour-backend_mapping
      prefix: /backend/
      service: tour:8080
      labels:
        ambassador:
          - request_label:
            - backend
spec:
  ports:
  - name: ui
    port: 5000
    targetPort: 5000
  - name: backend
    port: 8080
    targetPort: 8080
  selector:
    app: tour
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tour
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tour
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: tour
    spec:
      containers:
      - name: tour-ui
        image: quay.io/datawire/tour:ui-0.2.1
        ports:
        - name: http
          containerPort: 5000
      - name: quote
        image: quay.io/datawire/tour:backend-0.2.1
        ports:
        - name: http
          containerPort: 8080
        resources:
          limits:
            cpu: "0.1"
            memory: 100Mi

modified tour.yaml(removed backend and changed the image)

---
apiVersion: v1
kind: Service
metadata:
  name: tour
  annotations:
    getambassador.io/config: |
      ---
      apiVersion: ambassador/v1
      kind: Mapping
      name: tour-ui_mapping
      prefix: /
      service: tour:5000
spec:
  ports:
  - name: ui
    port: 5000
    targetPort: 5000
  selector:
    app: tour
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tour
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tour
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: tour
    spec:
      containers:
      - name: tour-ui
        image: quay.io/integreatly/tutorial-web-app:2.10.5
        ports:
        - name: http
          containerPort: 5000
        resources:
          limits:
            cpu: "0.1"
            memory: 100Mi

ambassador-service.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: ambassador
spec:
  type: NodePort
  externalTrafficPolicy: Local
  ports:
   - port: 80
     targetPort: 8080
  selector:
    service: ambassador

Please help, I'm really confused what is the cause behind it and how I can resolve it.