The problem is that you modified your source instead of removing it before creating a new one purging your old info in the process. The source folders are used for scraping only. Once you have added items to your library they are stored as complete paths and any changes to your sources are not propagated to existing library items. The point is moot now but if changing your subnet and using the old IP address for your NAS was not an option the only correct way to deal with this is to ether dump your Library’s or use path substitution to redirect to the new IP address. As you now likely have the same content being pointed to from two addresses using substitution will lead to duplicates and ongoing issues. I would highly recommend starting with a new library as JimKnopf pointed to. I would just add to that post that if your going to delete the databases he pointed to you should also remove the texturecache13 db and the entire /.kodi/userdata/thumbnails/ folder as well.
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