Shipping locations and shipping profile

[SDBdigital]

I'm having an issue with my shipping settings.

We ship from 3 locations.

But only one location can ship frozen goods - so I created a profile for those products.

Now if a customer orders multiple items, some that belong to the frozen goods profile and others belonging to regular shipping zone, the shipping costs get added together, essentially doubling the shipping costs.

How do I fix this?

[Project108]

@SDBdigital  which shipping software is integrated to your store? Let me know so i can advise.

[SDBdigital]

Hi we don’t have shipping software installed. 
shipping is handled in-house.