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The other way that tasks can be duplicated is if you mark them complete (which will create the new future task), change your mind and uncheck the task (doesn't remove the future task), then mark it complete gain which creates another future task.

This used to happen to me a lot. I'm indecisive.

I sent a bug report to Omni about this and they replied "Don't do by clicking, use undo instead"! Which is fine as long as you don't do anything else in the interim.
(A guy goes to his doctor and says "Doctor, it hurts when I do this" to which the doctor replied, "Stop doing it then")

I took their advice but it still catches me out every now and then.