There's not truly any way you as a player can get items to show up properly for everyone, mostly due to how the game is made and handles items.
If one player has a different listing of in which order a certain items show up, something that can just be off by one item, it will show up differently for them and there's nothing that can be done since users individually handle these in their game folders.
In a perfect world everyone would have the exact same item pack, and everyone would know how to install their items without aany mishaps or slip ups causing a different order but sadly this is not the case. The only thing you can do as a user is to ensure you installed the item pack correctly and nothing was missing from it, and check with your friends that they have the same item pack and also installed it correctly themselves, but beyond that there's not much you can do since there will always be users having different item packs. I myself for one have been using Delays and Ringos item pack since it was made and haven't changed it ever since.
But if you know that you've installed it correctly, I'm sorry to say that there's not much more you can do since there will still be many users out there not using the same mods, same packs or even installed it the same way.