Too many duplicate categories

If you look at this product you’ll see the problem with categories when the box is checked to add products to all categories:

http://www.redkitecreative.com/dev/akg/product/hood-gas-strut-support-all-models/

If I uncheck the box for ‘add to all categories,’ then what I get in that category list is ‘Tools, Tools, Tools, Tools, Tools’ etc.

If one item is in many categories but the ultimate subcat name is the same (‘Tools’) what should I be doing to my category list to fix this? I’m not sure what I should ideally be seeing for this product’s categories at this point.

https://wordpress.org/plugins/woocommerce-csvimport/