I'm not sure what the script does, but I'm assuming it means that you should put the items in order in the database.
Like this:
Potion
High Potion
Feather
Special Feather
Instead of them being random:
Feather
High Potion
Special Feather
Potion
It sounds like the script organizes the player's inventory based on the database. I'm not sure, though. It'd be helpful if you could provide a link to the script.