There is a problem with the postage options offered to a customer when they place an order in their ecwid basket. Two postage options are offered when the change delivery for location button it checked, one of which is correct for the item's weight, and the other is for a much heavier item! Why is this when the object weight is the same? I thought that options would be scanned down the list so after seeing the fast delivery option, the slow option for the same weight listed underneath the fast option would be selected. Any ideas? Thanks.