Code duplicate in test editor

I am on the very first lessons in html. The editor is duplicating code and jumping to new lines. Is there a bug fix? Or an article than someone can point me to? It will duplicate exponentially. It happens on each lesson.
Is this the correct area to ask this question?

What type of device are you using? What browser? Unfortunately, we’ve found that the code editor plugin FCC used does not work well for mobile devices.

That is likely the problem. I am using android devices. I have tried with Firefox and chrome. I will experiment with different browsers and will use my PC in the mean time. Thank you for your response!

I was able to find an efficient workaround. Using Samsung Browser and the keyboard app Hacker’s Keyboard. Works flawlessly. Hopefully this can help others!

I’m glad you found a solution!