Hello,

Try to deactivate all third parties plugins not related to the theme. Also, check if you have configured and added your attributes correctly, check this documentation https://docs.woocommerce.com/document/variable-product/

Finally, update your theme to the recent version. Follow the instruction provided to make update correctly. https://xtemos.com/docs/woodmart/update-theme-2/

If the issue has not been resolved contact us with credentials.

Best Regards