Hello,
Maybe you are using a custom layout for a single product page, which is built with the WoodMart WooCommerce builder. Simply go to Layouts > edit single product layout and add the product review widget.
If the issue remains, make sure Reviews is enabled in the WooCommerce > Settings > Product.
Also, make sure Reviews is enabled via the settings of the product > Advanced > Enable reviews:
https://gyazo.com/7100a5850532bf22d7861e277d40be79
Best Regards,