Applying Cart Price Rules affects totals in shipping

[ecompleteClem]

Hi,

When you apply FREE Shipping Shopping Cart Price Rules, the total of the 2nd Flat Rate shows 0.00 in the Shipping Method Box.

See:

Checkout (Amasty One Step Checkout):

Cart Price Rule:

When selecting 2nd Flat Rate:

[phamcuongmp]

If you apply FREE SHIPPING Shopping Cart Price Rules, all shipping methods will show the amount of 0.
Because this is the Magento feature, there is no problem with the Multi Flate Shipping.