UW 2nd pass, incorrect, scoring lower than first pass average %

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OK, this makes no sense to me, I started doing incorrect questions today and my % correct in each of the 2 blocks I did was lower than my average % correct.

Should I be worried about this? I feel as I'm picking up on details I overlooked during my 1st pass, but its still disconcerting to see a drop in performance with just 2 weeks left until my exam.