Hi everyone ! When I save the "Manufacturer" (root for manufactures) category, the type in the database changes from "manufactured" to "product". Then, all new manufacturers inherit the "product" type. Is this a bug or should it work like that?
It's a bug. Please make sure that you're editing the manufacturers from the Products>Brands menu and not the Products>Categories menu.
I see you didn't renew your HikaShop licence for 2 years now. So you must have a really old version of HikaShop which still allows you to edit the brands from the categories menu. That was removed and now you can't do that so you can't get that problem.