It is not a good idea to to mix and match staging and production. It is highly recommended to have your staging environment completely separate from your production environment.

In Hatchbox, this means having a separate staging cluster with its own server(s). The Production environment would be a separate cluster with another (and separate) server(s).

Since an app in a cluster will deploy to all the web servers in that cluster, the staging and production clusters/servers need to be kept separate so that you cannot use the same server to host both the staging app and production app in different clusters. 

If you want a separate staging cluster, make sure you do not use the same server in the staging cluster to try and also host the production app in the production clusters.