HI sorry for a bit late reply, no product is marked as ship separately, I even reinstalled and reconfigured the shipping plug in, but the problem is still there.
For example we have a kattle bell products in weights from 4 to 24 kg in increments of 4 kg, so the product weight is marked as 4kg and each attribute has weight adjustment of (its weight - 4kg)
The plug in calculates correct shipping rate only on the bases of base variant (if you add 1 of more pcs of 4kg kattlebell, if you add any other variant that weight is not factored in the shipping price).
Can anybody please explain this formula (maybe helps me figure out what the problem is)
Formula to calculate rates = [additional fixed cost] + ([order total weight] - [lower weight limit]) * [rate per weight unit] + [order subtotal] * [charge percentage]
because according to this we have it set up in this way:
[order subtotal] * [charge percentage] = 0*0 = 0
[order total weight] - [lower weight limit]) * [rate per weight unit] = [order total weight]- 0*0 = [order total weight]
and the final rate should be according to that = [additional fixed cost] + [order total weight] which does not make sense to me.