Reply To: Showing only the products from a certain category in the sidebar

Hello,

I have checked your provided link and checked the product “Flygt 2000 submersible drainage pumps” and in this product, there are two product showing with the same category “drainage pumps”
See screenshot for better understanding:
https://ibb.co/bmqLjyX

In general, the “Related Products” section comes from WooCommerce so please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand if is it our theme issue or not.

Best Regards.