Photoshop :: Add Noise Troubles

I am trying to create a star field for this school project.  I've been trying to create one using the Add noise feature on a black background.  I get to the point were I'm pretty satisfied with the end result.  I used some other adjustments like curves, brightness and contrast, and exposure.  All of these created a pretty solid star field.  However I've noticed two things when trying to save the image at hand as a JPG or apply the image to a new layer.  Both instances yield the image reverting back to the initial add noise, as if it adds the original noise I started with when I first began the project and I'm at my wits ends as to why it's doing that.