Since patch 2.5.2 in TBC classic (BBC) itemrack have no longer been able to swap gear sets that include ammunition. This can me switching from Bullet to Arrows while also switching from Gun to a Bow

Whenever you try to swap ammunition with itemrack, the ammunition just ends up, held by the curser. In some instances this breaks the rest of the item switching, leaving you in only half a set.

Please look into this whenever you get the time :)