Why are my shipping rates doubling at checkout?

Payments + Shipping & Fulfilment
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Topic summary

A merchant is experiencing an issue where shipping rates are doubling when a second item is added to the cart at checkout. They’re using a general shipping profile with a fixed rate of R169.99.

Key Details:

  • Products ship from one supplier, though potentially from different locations
  • The store has one location configured plus a third-party service managing inventory
  • Creating a new shipping profile with all products included did not resolve the doubling issue

Troubleshooting Attempted:

  • Screenshots shared show shipping profiles and location settings
  • Verified only one location is active in Settings > Locations

Potential Causes Identified:

  • Products may be assigned to different shipping profiles, causing separate charges
  • Third-party fulfillment apps (such as Print-on-Demand) may not be properly integrated
  • Items shipping from different supplier locations could trigger multiple shipping charges

Status: Unresolved. Support staff recommended contacting Shopify via live chat for direct account access to investigate the configuration issue further.

Summarized with AI on November 16. AI used: claude-sonnet-4-5-20250929.
1

I am currently having problems with my store doubling my shipping rates at checkout.

2

Hey @Mj_Junior ,

Welcome to the Shopify Community!

This sounds like it could be a shipping profile issue. By default, only one shipping rate should be chosen by the customer, and they should not stack based on the number of items they have in their cart. However, this can occur if the customer orders two items from different locations or shipping profiles, meaning each item is being shipped separately from each location and as such, two shipping charges would stack and be charged to the customer. If you head to Settings > Shipping & Delivery, you can check your current shipping profile rates and zones. Are you selling from multiple locations and if so, did the customer order products from different locations?

Otherwise, shipping rate issues can also occur when third party fulfilment apps are not integrated into your store correctly. Are you utilising a Print-on-Demand app by any chance?

Look forward to hearing from you!

3

My products are shipping from one supplier but I’m not sure if from that
supplier it’s different location however if it’s so is there a way to
configure the problem and make it a fixed rate. I’m using the general
shipping profile with my rate at R169.99. As you can see below how my rate
doubles after a second item is added to the cart at checkout.

4

Would you mind sharing a screenshot of your Shipping Profiles? I’d also recommend checking your Settings > Locations to check how many you have active.

5

Screenshot_20231003-231245_Shopify.jpg
Screenshot_20231003-231245_Shopify.jpg720×1600 85.9 KB

Screenshot_20231003-231619_Samsung Internet.jpg
Screenshot_20231003-231619_Samsung Internet.jpg720×767 41.5 KB

6

I have one location and a 3rd part service that manages my inventory

Screenshot_20231004-003526_Shopify.jpg
Screenshot_20231004-003526_Shopify.jpg720×816 51.7 KB

7

I also tried creating a new shipping profile with all my products in them
but the same doubling action occurs.

8

Thanks for sharing those screenshots. It looks like we’ll need to access your account in order to take a closer look at what’s going on! Please visit our help center here and log in to get connected with an agent via live chat. Our team will be able to directly help you from there.