Why my progress in the forum was restarted?
Yes, it is. I almost finish the Reponsive Web Design certification and now appear as I never do it before.
I thought you were asking about your forum account. If your FCC public profile does not show any of the work you have done, then you have accidentally created a new account when you signed in. Account data is only deleted when you explicitly request resetting it and there are a couple warnings to prevent this. The only other reason an account would be gone is if you were a beta tester and your account was on beta. freecodecamp.org. Accounts are identified by email address, so try logging in to Free Code Camp with any other email address you may have.