I have installed and used this plugin. First off, this is a great plugin. It does the job quite well.
However, I noticed that the categories were being listed twice under Products->Categories in the WordPress admin.
After spending some time debugging it, I discovered that 2 entries for 'order' were being inserted into the 'wp_woocommerce_termmeta' table.
From looking at the code inside the '
woocommerce_osc_run_cats' function, the call to
"add_woocommerce_term_meta($term['term_id'], 'order',$category['sort_order']);", only appears once.
Going on a limb, I just commented out that call. Voila, now the import works perfectly, i.e. categories are listed only once!
I hope this helps someone else.