Double Add to Cart Issue with Smart Cart - Temporary Workaround

Update timeline

1. investigating Oct 16, 2025, 04:33 PM UTC

   We are aware of an ongoing issue with double add-to-cart events in Smart Cart that we reported on last week, which may still be affecting some users. Our team is actively investigating this further to find a permanent solution. In the meantime, we have identified a temporary workaround that can be implemented within your Smart Cart settings. If you're experiencing double add-to-cart events when adding a single product to your cart, please follow the steps below based on your version of Smart Cart: For New Carts (v2): 1. Go to your Smart Cart. 2. Click "Global Settings" at the bottom of the page. 3. Locate the "Product Form Submission Behavior" setting and change it to "Disabled (Smart Cart does not manage)." 4. Refresh your product page and test to confirm the issue is resolved. For Legacy Smart Carts: 1. Go to your Smart Cart. 2. Scroll down to find the "Product Form Redirect" setting and change it to "Disabled (Smart Cart does not manage)." 3. Refresh your product page and test to confirm the issue is resolved. For more details on the previously reported issue, please visit: https://status.rebuyengine.com/incidents/ddkm5p8xgb7c We will continue to work the situation and provide updates as soon as possible. We sincerely apologize for any inconvenience this may have caused and appreciate your patience as we work toward a resolution.

2. monitoring Oct 16, 2025, 06:13 PM UTC

   We’ve successfully tested and deployed a solution to prevent the duplicate add-to-cart (ATC) events from occurring. Our team has verified the fix with several stores that reported the issue, and we can confirm that it’s no longer happening. We will continue monitoring the situation over the next few hours to ensure everything is running smoothly. If you notice any unusual behavior, please notify our support team immediately.

3. monitoring Oct 16, 2025, 07:17 PM UTC

   We are continuing to monitor for any further issues. None have been reported or uncovered through testing at this time.

4. resolved Oct 16, 2025, 07:45 PM UTC

   The incident has been resolved. Our team will document the root cause and share the findings in this incident once available.

5. postmortem Oct 17, 2025, 02:10 PM UTC

   **Issue Overview:** Recently, some merchants experienced an issue where products were being added to the cart twice instead of once. This was caused by a conflict between Rebuy’s Smart Cart and the code in your Shopify theme. When both systems tried to handle the form submission at the same time, it resulted in duplicate items being added. ‌ **Why It Happened:** This issue started happening after a recent update to Shopify themes around October 10, 2025. While the issue didn’t affect all merchants, it did impact those with certain theme setups or third-party apps interacting with the cart. ‌ **Resolution Timeline:** * **Saturday 10/11:** Code update deployed to fix the double-add issue, but caused a secondary issue with Smart Cart not opening. * **Sunday 10/12:** Follow-up fix resolved the Smart Cart opening issue. Both problems were considered resolved. * **Monday 10/13 - Thursday 10/16:** Continued monitoring of the issue, with sporadic reports of duplicate ATC events. A temporary workaround was made available to merchants, and we tested the fix on multiple environments. * **Thursday, 10/16:** Final fix deployed to address the root cause and ensure compatibility with the Shopify theme update. Since this deployment, there have been no further reports of duplicate add-to-cart issues. **What the Fix Does:** The new solution ensures that if a product is added to the cart multiple times, the system will catch and remove any extra items. This prevents duplicate purchases and ensures the cart reflects the correct quantity. Importantly, this fix will work whether or not Shopify resolves the issue on their end, so there is no risk of the fix causing other problems. ‌ **Warning Message:** If this issue happens again, a warning message will appear, prompting you to adjust the Smart Cart settings. It will explain that there’s a conflict between Rebuy and the theme’s code and guide you on how to change the Product Form Redirect setting in Global Settings to "Disabled." ‌ **Next Steps with Shopify:** We’re working closely with Shopify to understand what triggered this issue and to improve communication on future theme updates. This will help us identify and resolve potential conflicts proactively. We’re also testing future theme updates in staging environments to catch any issues before they affect merchants.