Shopify doubles the shipping price when a customer order from more than one supplier

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I manage a print on demand store that utilizes multiple POD supplies (printful, prinitify, etc.) and weight-based shipping. However, when a customer orders a product from each supplier, Shopify doubles the price of the shipping rather than adhering to the shipping rules I've established.

For example, a shirt is 0.1lbs (printful) and a mug is also 0.1lbs. (printify). I have 0.1lb items set to $4.00 shipping and 0.2lb items set to $6.00. So, if a customer orders both a shirt and a mug, the shipping should be $6.00. However, Shopify ignores my shipping rules and simply doubles the price to $8.00. It does this because the locations are different (printful and printify), but shipping rules should absolutely take priority over this. It's quite a frustrating issue that I'm sure hasn't been solved, but I'm hoping someone has come up with a solution by now. 

I want to note that I don't want to use a free shipping model, and I don't feel as though a paid app should be necessary for what should be a basic feature.

Thanks in advance for any help on this matter!

Shopify Expert
1227 109 297

I had a similar problem and reached out to Shopify support. They told me it's a switchable feature but you have to request from them.

For example, by default multiple locations will incur multiple ship charges.

I would reach out to them, explain your situation, and ask them to charge shipping as a whole instead of individual items / locations. I think that will solve your problem.

Founder of Speed Boostr (Shopify optimization experts, theme customization, custom app development).
Creator of Shopify Analyzer (first performance analysis tool for Shopify sites, free for the Shopify community).
Creator of Order Automator (auto tag orders and customers + auto fulfillment + more automations).
More apps: Theme Scientist (A/B testing), Tip Jar (add a tip button), File Optimizer (optimize CSS, JS, Liquid).