I'm running chrome for mac and never have taken the course before. When I got to lesson 6 and 7 Getting Started and The Functional Approach, the code in the exercise had already been completed. And upon saving and submitting it was accepted.
Thanks for reporting! I think that this is a known bug, but I'm not sure what progress has been made on it. I'll take a look now and see what I can do towards fixing it
This should be fixed now
I'm seeing it done already, too. Chrome 47.0.2526.111 on Windows 7