Having the exact same problem with Venture theme.
Only happens on mobiles, browsers seem random. I can replicate it using the Samsung browser.
Topic summary
Multiple Shopify store owners report a persistent bug where customers select a product size (e.g., XL), but the cart defaults to the smallest size option (typically Small) instead. This issue has been occurring for at least 2+ years across different stores.
Key characteristics:
- Appears random: not tied to specific sizes, devices, or browsers
- Always defaults to the first variant in the list
- Affects only some items in multi-item carts
- Reported across multiple themes (Venture, ICON 2.0, BOOST) and device types
- Some users report it happens primarily on mobile devices (Samsung browser, Apple iPhone)
Attempted solutions (unsuccessful):
- Multiple Shopify support escalations to senior staff
- Deleting apps
- Switching themes multiple times
- Theme developer consultations
Current status:
No confirmed solution has been found. One user suspects Shopify’s “add first variant by default” setting may be involved, but this remains unverified. The issue continues to cause lost revenue and customer frustration, with at least one store owner considering migrating to another platform.
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