Can you email [email protected] to help us reproduce this? It sounds like a form is getting submitted somehow, which shouldn't happen. I haven't been able to reproduce in Firefox, Chrome, or Safari yet.
Sorry about this–we take security seriously.
Thanks, I've dropped you an email with the steps to reproduce. Somehow I had landed on a particular ladder page and it looks like it may have an older style log in modal.
Thank you! I'm tracking the bug over here and will fix soon: https://github.com/codecombat/codecombat/issues/1153
Nice response time!
http://codecombat.com/play/ladder/gold-rush?email=ohdear@exa...
edit: Seems to only happen after clicking log in on the main page right side bar rather than the header one.