Product variants not showing up in facebook shop properly

After installation of plug-in, facebook for woocommerce, all my products are able to be auto-populated in Facebook shop.

However, non of the variant size (standard, deluxe, superior) showed up in the front end of my facebook shop (oharaflorist) but I could see each of them in the commerce manager > catalog clearly for each product.

Checked with Facebook support and was referred back to this forum because they said that it’s an issue with woocommerce setting instead of Facebook setting.

Need help as I’m not able to find any similar problem/issue in the forum.

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