Board Thread:Club Penguin/@comment-26154899-20151207010229/@comment-4500149-20160105105646

After looking through the JSON file for the advent calendar on the app, it appears that the item types for all clothing and furniture items were specified as "PAPER_ITEM", so it's likely that attempting to obtain the Festive Chair from the calendar would result in obtaining the Fish Background instead (since they both have an ID of 954).

In theory, this would also mean that attempting to obtain the Holly Jolly Couch, Holly Jolly Tree, and Holiday Wreath through the advent calendar on the app would result in obtaining the Campfire Background, Christmas Background, and Space Squids Face Paint instead. If you obtained your items through the app and these items were added to your inventory, that could prove this theory.

I'm not currently able to test this since the calendar on the app seems to have ended on January 1st for whatever reason, but that possibly explains what happened. Sorry for the late post.