Hello,
I’ve checked your site, and you’re using a custom layout for the single product page. You’ve added the Product Tabs widget, which includes the Reviews tab — and after that, you’ve also added the Product Reviews widget separately.
That’s why the reviews are appearing twice — once inside the tabs and once below. To avoid this duplication, you can either remove the Reviews tab from the product tabs widget or remove the separate Product Reviews widget. You need to remove one review section from this layout.
Best Regards,