Theme not showing up in panel

I was uploading a new theme when I realized I need to copy some files over from my old one. However, I ended up having to move the copies back to the old theme. Now, my old theme won’t show up in the theme panel, but the files are all the same and nothing changed. I have tried to reupload the files again and again, but nothing happens. My URL is http://dee-sayz.com/wordpress.