Unstackable items are stacking

Things like guns and ammo.
Guns max stack is 1, but it can be stacked upon if crafted multiple at the same time. How do we fix this?

Max ammo is set to 256 but it can stack over 512 which is the maximum of one time per crafting (128x4)

In response to ClamChowder ():
Things like guns and ammo.
Guns max stack is 1, but it can be stacked upon if crafted multiple...
Use stack size controller to set limits
In response to ClamChowder ():
Things like guns and ammo.
Guns max stack is 1, but it can be stacked upon if crafted multiple...
Depends on what plugin you are using. Open plugin config, there must be split stacks options