For some reason I seem to be getting different values then you. However from what I got, there was only a single instance of a username 'michael' having a password 'michael'.
HOWEVER, of all of the people whose password is 'michael' 83 seem to CONTAIN the str 'michael'.
Of the set of usernames 'michael' there are 20 whose passwords contain the string 'michael'
Of the set of usernames containing the string 'michael' there are 276 passwords that contain the string 'michael'