This scenario has occurred many times and is quite frustrating:
1. DCUpdater runs and suggests updates. Other stuff going on, no time to respond.
2. A few days later, DCUpdater runs again. All the same updates are suggested, added to the end of the list. Maybe I'm away from home for a few weeks with my computer on remote access. By the time I get home, the list of 10-ish suggested updates has grown to a list of 100 suggested updates, with the same ones being listed again and again and again. Yech.