If you click the 'edit'-Button for changing the configuration of one record and then click the 'cancel'-Button to abort the changing the actual record displays double.
NOP 2.0
SQL-Server 2008
Windows 7
IE 9.0
reproducing:
in Configuration.Shipping.Shippingratecomputationmethods.Shippingbyweight.Configure create a new record:
e.g.
country: Bangladesh
Shipping method: By Ground
Order weight from: 5.00
Order weight to: 10.00
Charge amount: 5.00
click 'add record'
click 'edit'
click 'cancel'
the record displys double