USA Address Cleansing Transform giving Quality code as Q2 or Q3 for valid and invalid address

Hi,

I am testing USA Address cleanse transform with below address

NAME='Yazoo Valley Electric Power AS',

addr='2255 Gordon  Ave PO Box 8223',

CITY='Yazoo City',

PROVINCE='MS',

ZIPCODE='39194-0008';

When I run address cleansing with above address, I am getting quality code as Q2 or Q3.

When I change the house number to some invalid number and run the address cleanse, then also I am getting Q2or Q3 quality codes.

Below is the changed address:

NAME='Yazoo Valley Electric Power AS',

addr='22550000 Gordon  Ave PO Box 8223',

CITY='Yazoo City',

PROVINCE='MS',

ZIPCODE='39194-0008';

I am not sure what I am missing. Please help me on this.

Thank You