I can’t check your account because I don’t know the account name – but I’m fairly sure you did not do a password *change* – you did a password *reset*. A *change* requires you to know the existing password, and will allow you to open previously encrypted files with the new password. A *reset* just resets the account password so you can sign in – but you can’t open the previously encrypted files with the new password. If this was possible, AxCrypt would not be much of an encryption solution…
So, when you do a password reset, you get access to the account, but opening previously encrypted files requires you to know the password that was in effect at the time of the encryption – thus the term ‘file password’.