Hello koukstoreofficial,
Thanks for your patience.
Try to regenerate Regenerate the product attributes lookup table
in Woocommerce > Status > Tools https://take.ms/LGpvf
In addition, please check Woocommerce > Settings > Product tab > Advanced tab and disable Use the product attributes lookup table for catalog filtering
.
Also, please note that we do not give a guarantee for full theme compatibility with all existing 3rd party plugins. Sometimes, but not always, you need additionally customize the theme or plugin to make them work together.
Best Regards,