That is honestly the weirdest thing I have ever seen check to see if your students are hackers or are using a hacking program and try to report this to @Bryukh. Though I doubt that a glitch like this could happen because I have done everything possible in multiple levels of code combat and it is more likely your students have discovered hacking try to see if they have used any websites that could help make this possible.
Reply appreciated, but I took those screen shots on my account, on my own PC after I saw what was going on. It seems to have stopped, my guess now is that it was some kind of developer mode that got accidentally turned on for everyone.
Sorry about that, we spotted the error and fixed it about an hour after it popped up. If you see things that effect class use, please email support@codecombat.com or use the Intercom button (should be a blue button in the bottom right corner) to send us a message.