Only install Shipping, Payment and Order Total modules that you are using ...
Always use unique values for the Sort Order on the modules that you have installed or they can cause issues based on logical building of arrays and the like ...
If you do not add a Unit Rate to the Per Unit perweightunit shipping module then you are saying 0 x weight of order + handling which will mean 0 + handling and not be calculating the Per Unit perweightunit charges correctly ...
NOTE: when using Per Unit perweightunit be sure to check the settings in the Shipping/Packaging as the Maximum Weight shipped will affect this value incorrectly as this particular shipping module is now using the products_weight for its calculations and the default settings assum that products_weight is the weight of a product and not its shipping cost ...
NOTE: This includes the Tare weight was well ...
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