Unfortunately, that was a self goal! 
It was only there for the initial two minutes, but fixed later. Please hard refresh the page and let us know if it still exits.
Logged out multiple times 
Try refreshing?
yup it works after 5 to 10 refreshes 
When you are automatically logged out, you would receive a pop-up saying the reason. If you got that alert, what did it say ?
and if i refresh same page again it says -
The page you’re looking for used information that you entered. Returning to that page might trigger a repetition of any action you took there. Do you want to continue?
after click yes -
I tried to update and restart. Then everything flew away …
So you’re saying after manipulating your local machine, Codechef servers worked fine. huh?