Funcom did not intend for arrows to be dismantled in the dismantling bench as they break down to provide more materials that it takes to make them… when we craft arrows we make a set of 5 or 10 with one set of materials. However the dismantling bench dismantles 1 arrow to materials …eg 1 steel bar yields 10 steel arrows…but dismantling one steel arrow yields 1 steel bar …
Of course, they Could have coded in so that the bench needs a stack before it starts the script to dismantle them … eg 20 arrows dismantle only
OR they could have changed what they dismantle to … eg any arrow to one feather …