I made a reservation and tested the password function by entering random letters and numbers. Then I went back and tried to modify the reservation without typing any password at all and the modification was accepted. Any idea what's going on.
I can give you a link to the site if that would help.
As you can see on our demos at:
... unless the reservation was created without any password, you do need a password to make modifications.
So, yes, if you give me the URL I will see what's going on at your site.