Resource Showing in a Project that WAS NOT assigned to project

Hi All, i have a problem where a resource that wasn't assigned to a project is showing up in that project. They are not assigned to any task just listed as a possible resource in the staffing view. It is causing issues b/c when they are viewing project they are on it shows them these projects, but they really are not part of them. I have checked all templates, inherited permissions and can't figure out how this is happening. If anyone has any ideas I would really like to hear from you, thanks. Vicki Vicki Morgan