I’ve noticed that all of my products that have variables have no “add to cart” button.
The prices for each product are defined in the backend, and troubleshooting this on WordPress’ forum leads me to believe this may be an issue with Royal.
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Please update the theme to the latest version.
Before update delete “woocommerce” folder in the directory wp-content/themes/royal/ and it’ll be reuploaded from a new theme package.
Also update all required plugins http://www.8theme.com/download-plugins/ .
Don’t forget to create back up of your files and database before starting update process!
(it’s for Legenda theme but the process is the same).