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We have just checked your site and see you are not using product attribute images from our theme.
You are using Color Swatches from an plugin.
So maybe the issue from plugin, please contact plugin author about it.
yes I am using a plugin for swatches, and I have contacted with it before you. Attributes and variations are setup with standard woocommerce configuration. With storefront theme, it works and image change.
if I dissable the swatches plugin, image doesn’t change either. You are welcome to dissable if you want.
I don’t find “product attribute images from your theme” in control panel and documentation.