for me it was helpful to know what should happen:
When you turn zumi on, the display should immediatly show some action (something like waking up, loading).
Then it will show a message that you should connect to the wifi called "zumi0123".
It will recognize that you connected to the wifi and will then display a message that you should go to "zumidahsboard.ai".
In my case, it didn't display most of the messages. It seemed that the display conenctor was a bit lose.
The fact that you see the webpage from the internet and not the one produced by zumi, shows also that you are still connected to a different network and your system does not try to connect via the wifi of zumi. Make sure that you are connected to the zumi wifi and try to remove any other ethernet cable etc.
You PC also might fallback to your standard Wifi, because it will notice that there is no internet available on the zumi wifi.
hope that helps.