Blank swatches typically occur if the color codes or custom images for your product option values are added but not fully uploaded. This is an easy mistake to correct:
To Fix This Issue:
Make sure after adding your color codes or custom images in Swatch King, you explicitly click the Update button (given at the bottom of the pop-up) to save these additions. This crucial step ensures your changes are applied, preventing swatches from appearing blank on your storefront.
Following this simple yet essential action will help display your swatches correctly, enhancing the shopping experience on your site.
For detailed instructions on how to add custom images or color codes for Shopify Variants and Product Groups, refer to the following guides: