Weird behavior when clicking on shiny app

I checked the app runs fine inside docker using the command (it takes around 21 seconds to have access to url)
docker run -it -p 3838:3838 shiny_app

I used exactly the same config as shown in the Shinyproxy documentation page

here my application.yml file

proxy:
  title: Open Analytics Shiny Proxy
  logo-url: http://www.openanalytics.eu/sites/www.openanalytics.eu/themes/oa/logo.png
  landing-page: /
  heartbeat-rate: 10000
  heartbeat-timeout: 60000
  container-wait-time: 100000
  port: 8080
  authentication: simple
  admin-groups: scientists
  # Example: 'simple' authentication configuration
  users:
  - name: jack
    password: password
    groups: scientists
  - name: jeff
    password: password
    groups: mathematicians

  # Docker configuration
  docker:
    cert-path: /home/none
    url: http://localhost:2375
    port-range-start: 20000
  specs:
  - id: shinyapp
    #display-name: Hello Application
    #description: Application which demonstrates the basics of a Shiny app
    #container-cmd: ["R", "-e", "shiny::runApp('/root/euler')"]
    container-image: shiny_app
    access-groups: [scientists, mathematicians]

logging:
  file:
    shinyproxy.log

I tried to add container-wait-time, heartbeat-rate but still showing undefined in the navigator after clicking on the app. I had to return to previous page and re-click on the app url to finally have access

Any ideas what could be wrong on the yml file ?

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