Yesterday I was doing c ladder on ahmed-aly and I decided to try a new thing. I clicked on my account and I changed my handle from t3rminated to I_love_Tanya_Romanova(no bad intentions bohdan :) ) and what I saw that I unlocked the first 76 problems.
I think that its a bug.
P.s. I Changed back my handle to -NE0- :)
If you really want to train just ignore this. You don't want to lie to yourself.