I followed the instructions in this KB article CS-Cart Documentation — CS-Cart 4.15.x documentation and deleted all the demo categories, products, orders plus some filters, features, etc. Now in the Admin panel I can't see any demo category or product, but when I go to Administration–>Export data, the demo products still show up in the spreadsheet! There are around 238 of the demo products show up in the exported spreadsheet, the “Category” column are all blank for these demo products now that I have deleted all the demo categories.
Now it seems that there's no way I can delete them from the admin panel as I can't see them.
Is this a known issue or someone else had this problem before?