Iphone app syncing problems?

Every time I plug in my iphone 4 to my computer it usually syncs to Itunes. Even though I have "Automatically Sync New Apps" box unchecked it still installs apps that are on my Itunes but i don't want on my iPhone. This used to not happen until recently. Can someone explain to me why this is happening and how to fix it?

Goto iTunes > Preferences > Device Preferences.

Check "Prevent devices from syncing automatically"

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