Stop reuploading existing tracks to spotify playlists

[Dzoker]

I don't know why but every few weeks or so spotify reuploads the entire playlist together with new and old songs, nullifying the purpose of the "sort by recently added" option. I want to know which songs in a playlist are new. In other words something like a subscription to a youtube channel, where i will be notified of each new song added to a channel.