If they came with metadata you could try deleting the products (right-click on the container in the Products list in the Content Library pane), then reimport their metadata (Content Library option menu, the lined/hamburger button in the top corner or right-click the tab)>Content DB Maintenance, check Reimport Metadata, then in the next dialogue select just the products you are reimporting. Of course I'd try this with just the one product to see if it helped rather than doing the whole lot in one go and possibly make things worse..