FH is programmed to read the items off of your own computer based on the order they are in. For example:
The order you have your items is: Hat, Sword, Bubble
The order they have their items is : Hat, Bubble, Sword
You will both see a hat, but if you equip a sword and they equip a bubble it would look like two swords to you, but two bubbles to them. If you equip the sword and they equip the sword you'll see that you have a sword and they have a bubble.... but they'll think YOU'RE the one with the bubble because of their order of files.
Does this make any sense?