Different content_ids on Woo archive page and single product page

Hi there!

Setup: WooCommerce, Flatsome theme, “Use SKU as ID in the product feed. If no sku, it gets the ID for default.” setting set.
On our single product page, tracking the add to cart event works fine with the SKU as content_id. However, on the product archive page, when the ajax add to cart button is clicked, instead of the SKU, the content_ids value contains the product ID.

Any idea what might be causing this?

Thanks!