I’m having the same issue.
Using Chrome browser.
Accepts my sign in email address and the short code but when I click the ‘go to the coding curriculum’ button I’m sent back to a code challenge I’ve already completed and the ‘Sign In’ button on the top right hand corner reappears (Not sure if this is an issue).
None of the code challenges I’ve completed has a tick and according to my profile I’ve completed 351 of 1409 coding challenges.
Whenever I complete a code challenge the completion rate does not increment up to 351.
To access the settings menu option I have to click on the Sign In button again. This enables me to logout.
I look forward to hearing from you
Thank you