This must mean that some part of your mesh is missing from the pack islands operation (likely hidden or unselected). As far as I understand it there’s one or more mesh islands throwing of the consistent scale of the packaging causing them to be green.
If you post a download link to your .blend file I’ll be happy to take a closer look. The best way to do this is by uploading your file to Dropbox, Google Drive, Mega, or equivalent file hosting service then copy + pasting the share link here.
