ItemsAdder automatically updates items in the world.
This is useful to avoid having to give updated items manually to your players.
Disabling update for a single ItemStack instance
To disable the auto update for a single item in the inventory, you have to use this command:
/iaitem set-itemstack-auto-update <true|false>
Disable update for a certain custom item completely
You can also disable auto-updating for certain items completely, in their configuration file
For example you might want to change the attack damage of a sword to a higher value, but you don't want already crafted swords to have the new attack damage because they would be too op, because people might have crafted a lot of them.
So the already crafted swords will still keep the old attack damage.