When you create a server adapter for an existing application, in case it's missing, the server name is made after the first app in the domain, not the selected app in the openshift explorer view.

In my case, I had 2 applications: "html5" and "test", and I wanted to create a server adapter for the "test" one (using the "Create Server Adapter" command), but the name was "html5 on OpenShift"