Code simulator problem

Everytime I start typing code in the lessons it duplicates my code.
Every character I press leads to a new copy till the screen is filled with copied text. Need help fixing this.
Tired different browser and not working.

Welcome, there.

It sounds as though you are on a mobile device. The curriculum is not suited for this, and we cannot guarantee a smooth UX, but there are workarounds:

I hope this helps