So i signed up a couple of weeks back and really enjoyed the lessons and want to go for certification!
I started from the very beginning and got up to [38]… I logged back in earlier this week, and it has all gone! i am back at [1]!
I have seen some posts regarding duplicate accounts / github accounts previously for people with the same issue, however i only signed up using 1 email address, no github / facebook linking. I have also verified my email.
It just seems so ironic that a website exclusively aimed at coding, has lost the progress of people because of a coding issue! 
Thanks for the quick response! As far as i can remember, i never gave a username.
I tried the link, but unfortunately, i get this message: “We couldn’t find a page for /yourUserName”
Not sure what else to try
Had a look, and in the top right corner, there is a square icon with a person at a laptop (all brown tones).
When i click on it, i have option to change settings, link with github, signout etc. But there is no user name. There is a long string of letters & numbers though (fccd3269920-b63e-4964-b674-ab6a1f193bd3)
It does seemed to have saved the re-submitted pieces up to [8] now. I will try another solution if any are available, but think i will just have to re-do all the other lessons and hope it still saves this time!
Thanks for your advice