Duplicate songs

See Duplicate songs in iTunes/Music - Apple Community for general advice. If your library is free of duplicates then it may help to sign out of your Apple ID for music on the device, then sign in again.

tt2

Thanks for posting in the Apple Support Communities fritzio,

First, check to make sure you don't see duplicated tracks in the music library you're syncing from. Than try syncing your iPhone once more: Sync your iPhone, iPad, or iPod using your computer

If you need more help, providing additional information might increase the chance that you'll get a helpful response from the community.

Cheers!