The kids are having a party in the park and need supplies. Remember, this is a party for younger kids. There are several categories of objects that will work here: snacks, desserts, entertainment. If you have already made some objects from a single category, then if you make more objects from that category, they might just disappear and not count toward your Starite. This isn't a bug. It just means that you need to start adding things from a different category.
- Ice Cream