AxCrypt encrypts files using the password provided when encrypting. You need to provide that password. The files you are trying to open, are encrypted with a different password than the one you’re using to sign in with to AxCrypt.
When you try to open one of the files you mentioned, AxCrypt first tries the password you are signed in with. That apparently is not the correct one. So AxCrypt asks you for the file password.
You then type the same password you are already signed in with, which won’t help, since that is already tried. So, AxCrypt tells you this.
You need to remember the original password used to encrypt the files in question.