Nov 23, 2015 - 01:43 PM
There can be a few reasons as to why your rates are off
1) Dimensions of the item are not correct
2) Supplier / Supplier Warehouse Address is not correct
3) if you are using your UPS/FedEx/Endicia Credentials API it will pull the rates based on your accounts negotiated rate.
Fix these issues and your rates should be accurate.