How can I unify shipping rates for mixed offers on my clothing website?

Hello, I’m currently having a little issue.

My website (orathepeople.com) sells clothing (mainly t-shirts and hoodies) with a print-on-demand method—the customer orders and the facility prints the garment, then ships it.

Recently I’ve started using a mixed offer from 2 different facilities and here’s the issue: the system doesn’t unify the shipping rate. Basically, if I order ITEM A from Facility 1 and ITEM B from Facility 2, I’ll pay 18€ (9€ per shipment) instead of 9€ altogether as I’d wish and set up.

Anyone has any idea on how I could fix this in settings?

Did you set both locations in your shipping profile? Also which conditions did you use for the price calculation?

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