I have had the same experiences with my friends and myself, and as far as I know there is no way to fix this except one. The only reason why you are seeing one thing while someone else sees another is because you both have different item packs, either because yours or because the other person's is outdated. The best way to solve it is to make sure you yourself are updated on items, I tend not to worry much about what the other person sees.
The recent item pack, Pawsome Item Pack V4, is here (I tried looking hard, but the only good result of finding the download was this link)--->
http://thabiue.deviantart.com/art/Pawesome-ITEMS-Pack-V4-DL-10-5-13-377205907Hope this helped