When printing the label for an order with multiple parcels, the parcel weight is worked out by using the average weight across all parcels. Each individual parcel weight will not be used.
Example
If the order has three parcels:
Parcel 1: 5kg.
Parcel 2: 10kg.
Parcel3: 15kg.
Calculation: (5 + 10 + 15) ÷ 3 = 10Kg.
The total order weight will be divided by the number of parcels meaning in this example each parcel will show a weight of 10kg. This is the way the system has been designed.