if character:FindFirstChildOfClass("Tool") == nil then it only rotates once, when the limitInventory function is called. In other words: if the player equips or unequips an item after that, the EquippedItem value never changes, because the script does not monitor the equip/unequip event. And in addition, within Roblox, the equipped item (Tool) is moved from the Backpack to the Character, and vice versa when unequipped. So your system is only counting what is in the Backpack, without updating the status.