More information - here is the setup for your existing project:
https://www.inaturalist.org/projects/qnc-2015-december-kroombit-tops-np?tab=about
You will see that the Location is currently set to “Worldwide.”
Edit your project, specify “Kroombit Tops” as the location, and save the project.
Now if you go to the Kroombit Tops place, on the Projects tab, you will see this project listed along with the other existing one.