Hello, @Kris,
1- Thanks for sharing the details and elaborating on your issue.
I have tested your issue on your site and found that other brands and search results for other products are working well. The issue is in the brand name “Boffalora” When I search it shows two products but if I check the brand page by selecting the brand from the brand filter it shows 4 products. Now, The two product that doesn’t appear in the search results of “Boffalora” are the:
https://certaplatform.com.hk/shop/wine/red-wine/la-sasa-riserva-docg-2017/
https://certaplatform.com.hk/shop/wine/red-wine/pietrisco-valtellina-superiore-docg-2018/
Now, Would you please try to delete these products completely and then try to add the product again manually, and select the different brand this time then check the results first if the products start to appear then edit the products again, and then set the brand to “Boffalora” then check back to your site after clearing the browser cache I hope your issue will be resolved.
2- It is a cache issue nothing else try to contact your service provider to flush the server cache and then try to disable the cache plugin until your site is in development mode. I hope you will never face any issues again.
Regards 8Themes Team.