You had an issue that others didn't have. The grub password is asked for
editing purposes only when booting BUT IF YOU ARE NOT TRYING TO EDIT IT IT
DOES NOT ASK FOR A PASSWORD. If you was asked for a password and you was not
trying to edit the grub then it is a bug or just an issue only applying to
you.
Now, you and us should try to reproduce that bug to know it is a common issue
or not. If it is, we could fill a bug form.
Also, to put a password in BIOS it's not the same. If I took that drive aways
from that machine and I put it on another one I'm beeing able to boot it and
that's a security/privacy issue.
