For this example, site structure is Home > Category > Sub-Category > Product.
I 301'd from a product page on domain A to one on domain B. The product page on A now displays as a backlink for not only the one on B, but the home page of B, as well as most category pages of B, but only one sub-category.
The domain A page shows as a backlink on this sub-category, but not its parent category -- its parent category is NOT found in the left nav menu. The menu contains mostly categories, but only this one sub-category. So right now, I have to believe that it has something to do with the left nav menu links.
Am I wrong in thinking that it should only show up as a backlink on that one page where the 301 was instanced?