It looks like your product is a member of multiple product category hierarchies. While WordPress supports this, it does not provide a method of determining what category is the most important one/most correct one to show when a post (of any post type) is a member of multiple terms within the same taxonomy. There are ways of influencing the category/term Breadcrumb NavXT uses. You can either write your own hook into the bcn_pick_post_term filter (have the filter return the term you want to use), use Order Bender (an example of how to use the bcn_pick_post_term filter), or Breadcrumb NavXT Paths (especially if you want the user’s path to visiting a post influence the breadcrumb trail displayed).