Issue with syncing

Hello all 🙂

I seem to be having an unusual problem when syncing my iphone.

In itunes,2 of my playlist always syncs everytime i click the sync button.

It should not do that if i'm correct,as only newly added songs will sync.

It's a real pain cos' the 2 combined folders have more than 500 songs😮.

This started happening since the latest 6.01 update.

Does anyone know if there is a fix to my odd problem?

Any help would be greatly appreciated.

Thanks in advance 🙂