Hi there mitch.w,
It sounds like you have verified that you have manual syncing enabled on your iPod but iTunes insists on syncing media you dont want to it anyway. I would start by unchecking the checkbox to sync music to your device, and applying that:
Sync your iPhone, iPad, and iPod with iTunes using USB
Then restart both the computer, and your device:
Restart your iPhone, iPad, or iPod touch
- Press and hold the Sleep/Wake button until the red slider appears.
- Drag the slider to turn your device completely off.
- After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.
Then sync the music back to your iPod and test the issue out again.
Thank you for using Apple Support Communities.
All the very best,
Sterling