a lot of the time the game will not cooperate with you when you try to press backspace in chat or a command block or on a sign. this usually gets fixed when you cancel it and redo it but after a while it gets really annoying. Especially on a sign because if you back out the sign It will cancel it out and you have to break the sign and replace it and type your text again. Even after you do fix it by canceling and re doing it will still mess up again. PS: this affects Windows 10 from what I saw but it might be on the other devices as well.