If you enable a product-specific hop link, you must enter a product-specific share % you want to grant for that product, as that would override your common share % on all affiliate-referred sales of that product, regardless of which kind of hop link the buyer followed. By setting the product % to 0 or blank and enabling its hop link, you are effectively disabling standard affiliate commissions for that product, so only the Extra % you grant to individual affiliates would apply.
