Issue with category tree

-- HikaShop version -- : 3.4.0
-- Joomla version -- : 3.8.7

Hello,
I just installed the business edition but I am having some issues with the category structure. I had a starter edition already installed and I played with it months ago, at the time I must have messed up the category structure.
After installing the business editions I saw 2 "roots" categories (at least 2 categories with the worl icon), so I clicked "rebuild", but thsi duplicated all the existing categories... when I try do delete any of them I get the error message "You cannot delete a default category"

Nevermind... I was in a hurry so I just deleted all hikashop db tables, reinstalled and reimported the existing products. This did the trick