Sync with Iphone new itunes, creates a new playlist 1 on its own.

Just downloaded the new Itunes.

Does anyone else have an issue where they sync their iphone to their itunes and if they added new music to that playlist, it will create a duplicate playlist with the songs before it was added?

For example: I add songs to "playlist" on my itunes. Then when I sync my iphone to add the updated playlist, it creates a "playlist1" with the songs BEFORE I added them to the playlist....??

I'm so confused as to why this is happening!