Set multiple shipments

[robytotem]

Hello everyone, I use VM 2.0.20a with J2.5.11. I would like to set different types of delivery (courier) based on the weight of the product which is in the shopping cart:
I set the check on "Enable automatic selection of the expedition?".
From what I understand it works VM, based on the weight that one fits for each object, is calculated or a courier or another. I create two couriers, which I call:

1) TNT (0-5kg) and imposed minimum weight 0 and maximum weight 5.00 (Unit: kilogram)

2) TNT (5,1-100kg): weight and imposed minimum 5.1 and maximum weight 100.00 (Unit: kilogram)

To test, I go on a product in the tab "Product size and weight," insert the values ​​of the weight of the product, for example 1.00 (expressed in kg). If I go in the front end, I add the item to the shopping cart and choose me as your payment method rightly TNT (0-5kg) but if the object now imposed a weight of 7.00 should appear in the front-end method TNT (5 ,1-100kg) because in this case the object weighs 7.00 kg ... and instead appears ALWAYS TNT (0-5kg) ...
why?? What's wrong ...

I hope you can help me, I can not put your website online for this problem!

thanks

PS: why is referred to twice the unit of measure? I read Kilogram and below kg , is correct as I set I?

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