If your product has 2 review sections after installing Ryviu: Product Reviews & QA, please follow the steps below to solve the issue.
Go to Sale channels > Online store > Themes > select Edit code
In Templates > open product.liquid file, find this Ryviu widget code at the bottom of your file
Delete that code and click Save file. Reload your page and check
Duplicate Review section issue on Debutify theme
If you are getting the issue on Debutify theme, please follow this instruction to solve the issue.
Go to Sale channels > Online store > Themes > select Edit code
In Snippets > open product-template.liquid file, find this code below
{% render 'review-widget', product: product %}Delete that code and click Save file. Reload your page and check.
If you don't know how to solve it, contact us and let us know your store URL so we can solve it for you.
All the best,
Dan from Ryviu team