Black circle after self-hosting installation

[Seblb44]

I set-up a selfhosted instance of Heyform on my Raspberry Pi 5, trafiic is routed through a cloudflare tunnel. Here is my compose file however i get only a white page with and empty black circle in the left top corner of the page. The container log seems to be all good and do not show any error. What is wrong

heyform:
    image: heyform/community-edition:latest
    restart: unless-stopped
    volumes:
      # Persist uploaded images
      - ${APPDIR}/${COMPOSE_PROJECT_NAME}-appdata/heyform/upload:/app/static/upload
    depends_on:
      - db_mongodb
      - db_redis
    ports:
      - ${PORT_HEYFORM:-5022}:9157
    environment:
      APP_HOMEPAGE_URL: https://form2.${DOMAIN_NAME}
      APP_DISABLE_REGISTRATION: false
      UPLOAD_FILE_TYPES: ".jpg,.png,.jpeg"
      #UPLOAD_FILE_SIZE
      SESSION_KEY: key1 #${HEYFORM_SESSION_KEY}
      FORM_ENCRYPTION_KEY: key2 #${HEYFORM_ENCRYPTION_KEY}
      MONGO_URI: 'mongodb://db_mongodb:27017/heyform'
      REDIS_HOST: db_redis
      REDIS_PORT: 6379
      #VERIFY_USER_EMAIL:
      #SMTP_FROM
      #SMTP_HOST
      #SMTP_PORT
      #SMTP_USER
      #SMTP_SECURE
      #SMTP_IGNORE_CERT
      #SMTP_PASSWORD
      GOOGLE_RECAPTCHA_KEY: ${RE_CAPTCHA_SITE_KEY}
      GOOGLE_RECAPTCHA_SECRET: ${RE_CAPTCHA_SECRET_KEY}
      #AKISMET_KEY
    networks:
      - default
      - db_net