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It sounds like G+ has been way to busy. It is possible that it was syncing your photos with your Picasa web albums in the background. Have you disabled that in your Google account settings?
I've recently started with Google+ and photo sync is, as far as I remember, off by default. However, open the app and have a look at the settings and make sure that it's either off or set to sync over wifi only.
If all else fails, you could go into Settings on the phone's main menu, open Accounts, then expand Google and check the list of what's sync'd there.