I can see that some resources that are not in the staffing profile but they are available to me for selection in the resources list on a task in the work plna.
What all users get listed there? is there any defined criteria?
Check the server.conf setting com.kintana.core.server.RM_OVERRIDE_ASSIGNMENT_CONTROLS. If it is set to true, you are able to assign resources not listed in the staffing profile.