Let me explain.
Device is a device. You add it via web console or via app, the device shows up on both web as well as the blynk app.
I would say, you better delete all the devices n start from scratch.
First create a template, create data streams, place widgets on the web dash(if required)
Copy the provided template id n device name, paste it in your code n upload it to your board.
Now power up your device, open blynk app and click on add device(follow the steps that the app prompts)
After successful adding of the device, you can click the spanner icon n start to add widgets and tie then with the data streams that you created earlier.
This is the whole process to add a device. If you have followed this step correctly and you have added to different devices, then you have run out of devices ( 2 free devices under free plan )
If you want more devices you need to subscribe to plus or pro plan.
Edit: webdash is there so you can control your devices through your computer’s browser. There are only few widgets on webdash n more to come.
The device on web n app are both same.