Artem, thanks for looking at my history and explaining to me what happened. I got the answer from chat at the same time you posted. To answer your question, I believe a stronger message or popup saying "WARNING - this will disable room protection!" would help beginners in the future to avoid such mistakes.

I figured out what's going on in chat: Breaking a wall destroys noob protection. The guy before me did the same thing.

Artem, it's not like in the article. Check out my room's history: https://screeps.com/a/#!/history/E33N8?t=11858566

Is there any update on this? This is pretty much the reason I'll stop playing.