Checkout reliability
A default variation was added without the buyer choosing it
Compare the saved default attributes, the matching variation and the selection displayed before add to cart with the actual cart item. WooCommerce allows configured defaults to select a variation without a fresh buyer choice. A variation using Any for an attribute can also match the selection, with the first matching variation taken from the top of the list. Those mechanisms can explain a preselected item, but neither proves what a particular buyer intended or what an earlier page displayed.
For: A research-only store owner investigating why a WooCommerce product could enter the cart without a fresh option choice.
Updated 2026-10-01