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Shipping Cost Multiplies When Adding More Products to Cart – How to Fix?


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I'm experiencing an issue with my PrestaShop store (version [insert your version here]).

Whenever a customer adds more than one product to the cart, the shipping cost gets multiplied instead of staying fixed or calculated based on weight/total. For example, if the shipping cost for one item is ₹100, adding a second item makes it ₹200, and so on — even though I’ve set it as a flat rate.

I’ve already checked:

PrestaShop version 8.2

Carrier settings (flat rate selected)

Shipping behavior in product settings

Advanced shipping settings and modules

But I can’t find why this is happening.
Any ideas or fixes would be greatly appreciated!

Thanks in advance!

WhatsApp Image 2025-06-16 at 12.32.39_3f49e9d7.jpg

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To help diagnose why your shipping cost is multiplying per item (instead of staying flat), could you provide a bit more information on your setup?

  • Please confirm your exact PrestaShop version (e.g., 8.2.x) and the PHP version running on your server.
  • Carrier Configuration Screenshot: Can you share a screenshot of your carrier configuration, especially the “Shipping locations and costs” and “Costs by” sections?
  • Cart Rule or Module Use: Are you using any shipping modules, overrides, or cart rules that might affect shipping (including third-party modules)?
  • Product-specific Shipping Fees: Do any of your products have individual shipping fees set under the “Shipping” tab in the product edit page?
  • Shipping Calculation Mode: In your carrier settings, is the “billing” set to “According to total price,” “total weight,” or “per item”?
Edited by El Patron (see edit history)
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PrestaShop version: 8.2.0
PHP version: 8.2.18

Cart Rule or Module Use:default prestashop module

Product-specific Shipping Fees: NO

Shipping Calculation Mode: According to total price

Screenshot 2025-06-17 123240.png

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These are handling charges, they will be applied . But the value 2,00 is far away from the 120 in you initial screenshot, so where did you set these?

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