ununderstandable line vty output

[Maged]

I set line vty in packet tracer as shown:
Router(config)#line vty ?
<0-15> First Line number
Router(config)#line vty 0 15
Router(config-line)#login
% Login disabled on line 66, until 'password' is set
% Login disabled on line 67, until 'password' is set
% Login disabled on line 68, until 'password' is set
% Login disabled on line 69, until 'password' is set
% Login disabled on line 70, until 'password' is set
% Login disabled on line 71, until 'password' is set
% Login disabled on line 72, until 'password' is set
% Login disabled on line 73, until 'password' is set
% Login disabled on line 74, until 'password' is set
% Login disabled on line 75, until 'password' is set
% Login disabled on line 76, until 'password' is set
% Login disabled on line 77, until 'password' is set
% Login disabled on line 78, until 'password' is set
% Login disabled on line 79, until 'password' is set
% Login disabled on line 80, until 'password' is set
% Login disabled on line 81, until 'password' is set
Router(config-line)#password cisco


I tried to set the password after the login command, I did that on purpose, the strange matter is when I used the question mark to inquire how many VTYs that router has, it answered with 0 15 which means that the router has 16 vty but when I set the login command before the password , It revealed that there are lines from 66 through 81.
would any one please clarify this plain contrast ?