This is driving me mad.
I've been keeping my iPhone and iTunes in sync for ages, and today all the the sudden iTunes tries to sync every single app on my Mac to iPhone, instead of just the one I installed.
I reset all contents and setting, restored my phone from iCloud, saw the list of my old apps, then plugged the phone back in. Again, iTunes starts syncing every one of my app back to the phone.
Any idea to get rid of this crazy behavior?