Canada Post differences in rates

[redk]

Hello,

Using ZC 1.3.7 with Canada Post module I get a difference in rates
from Canada Post web site and the CP module.

For example sending an order to my own postal code:
Weight is 1Kg
Lenght: 12 cm
Width: 12 cm
Height: 2 cm

Zencart Canada Post:
Priority : 34.36
Expedited: 14.06
Regular: 14.06

Canada Post Web Site:
Priority : 21.24
Xpresspost: 10.38
Regular: 8.61

P.S:
In Zencart no matter what I do Expedited and Regular rates are always the same, but takes less days with Expedited I wonder why I should use Regular

Any clues?

Thanks.

[Ajeh]

Check your Tare weight in the Shipping/Packaging ...

[redk]

Package Tare Small to Medium - added percentage:weight

0:0